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Point-specific interactions of isovitexin with the neighboring amino acid residues of the hACE2 receptor as a targeted therapeutic agent in suppressing the SARS-CoV-2 influx mechanism
2022
Nourin Ferdausi (Biochemistry and Molecular Biology, University of Dhaka, Dhaka, Bangladesh) | Samarth Islam (Department of Biochemistry and Microbiology, North South University, Dhaka, Bangladesh) | Fahmida Hoque Rimti (Bachelor of Medicine and Surgery, Chittagong Medical College, Chittagong, Bangladesh) | Syeda Tasnim Quayum (Department of Biochemistry and Microbiology, North South University, Dhaka, Bangladesh) | Efat Muhammad Arshad (Department of Biochemistry and Microbiology, North South University, Dhaka, Bangladesh) | Aashian Ibnat (Department of Pharmaceutical Sciences, North South University, Dhaka, Bangladesh) | Tamnia Islam (Wolfson Institute for Biomedical Research, Division of Medicine, University College London, London, United Kingdom. & Immunoinformatics and Vaccinomics Research Unit, RPG Interface Lab, Jashore, Bangladesh) | Adittya Arefin (Wolfson Institute for Biomedical Research, Division of Medicine, University College London, London, United Kingdom. & Immunoinformatics and Vaccinomics Research Unit, RPG Interface Lab, Jashore, Bangladesh) | Tanzila Ismail Ema (Department of Biochemistry and Microbiology, North South University, Dhaka, Bangladesh. & Immunoinformatics and Vaccinomics Research Unit, RPG Interface Lab, Jashore, Bangladesh) | Partha Biswas (Department of Genetic Engineering and Biotechnology, Jashore University of Science and Technology, Jashore, Bangladesh. & Immunoinformatics and Vaccinomics Research Unit, RPG Interface Lab, Jashore, Bangladesh) | Dipta Dey (Department of Biochemistry and Molecular Biology, Bangabandhu Sheikh Mujibur Rahman Science and Technology University, Gopalganj,Bangladesh. & Immunoinformatics and Vaccinomics Research Unit, RPG Interface Lab, Jashore, Bangladesh) | Salauddin Al Azad (Fermentation Engineering Major, School of Biotechnology, Jiangnan University, Wuxi, PR China. & Immunoinformatics and Vaccinomics Research Unit, RPG Interface Lab, Jashore, Bangladesh.)
Objective: Despite the development of several vaccines against severe acute respiratory syndrome coronavirus-2, the need for an additional prophylactic agent is evident. In recent in silico studies, isovitexin exhibited a higher binding affinity against the human angiotensin converting-enzyme 2 (hACE2) receptor than existing antiviral drugs. The research aimed to find out the point specificity of isovitexin for the hACE2 receptor and to assess its therapeutic potential, depending on the stability of the isovitexin–hACE2 complex. Materials and Methods: The pharmacokinetic profile of isovitexin was analyzed. The crystal structure of the hACE2 receptor and the ligand isovitexin were docked to form a ligand-protein complex following molecular optimization. To determine the isovitexin–hACE2 complex stability, their binding affinity, hydrogen bonding, and hydrophobic interactions were studied. Lastly, the root mean square deviation (RMSD), root mean square fluctuation, solvent accessible surface area, molecular surface area, radius of gyration (Rg), polar surface area, and principal component analysis values were found by simulating the complex with molecular dynamic (MD). Results: The predicted Lethal dose50 for isovitexin was 2.56 mol/kg, with an acceptable maximum tolerated dose and no hepatotoxicity or AMES toxicity. Interactions with the amino acid residues Thr371, Asp367, Glu406, Pro346, His345, Phe274, Tyr515, Glu375, Thr347, Glu402, and His374 of the hACE2 protein were required for the high binding affinity and specificity of isovitexin. Based on what was learned from the MD simulation, the hACE2 receptor-blocking properties of isovi¬texin were looked at. Conclusions: Isovitexin is a phytochemical with a reasonable bioactivity and safety profile for use in humans, and it can potentially be used as a hACE2-specific therapeutic to inhibit COVID-19 infection. [J Adv Vet Anim Res 2022; 9(2.000): 230-240]
Afficher plus [+] Moins [-]Production performance of Alabio ducks (Anas platyrhynchos Borneo) under different levels of drinking water salinity
2022
Abrani Sulaiman (Department of Animal Science, Faculty of Agriculture, Lambung Mangkurat University, Banjarbaru, Indonesia) | Surya Rahmatullah (Department of Animal Science, Faculty of Agriculture, Lambung Mangkurat University, Banjarbaru, Indonesia) | Hefni Effendi (Center for Environmental Science PPLH, IPB University, Bogor, Indonesia) | Gamaliel Simanungkalit (School of Environmental and Rural Science, University of New England, Armidale, Australia.)
Objective: To examine the effects of the salinity level of drinking water on the egg production and quality of Alabio ducks. Materials and Methods: A total of 60 female Alabio ducks, aged 6 months, were subjected to this study. All ducks were kept in stage-type cages (1 m length × 1 m width × 0.5 m height), where each cage was inhabited by 4 ducks for 56 days of experimentation. All ducks were offered a mixed ration ad libitum for laying ducks, according to the nutritional requirements for egg-type ducks. The treatment in this study was drinking water with five stratified salinity levels, namely P0 = freshwater (0% salinity); P1 = water with a salinity of 0.75 practical salinity unit (PSU) (equal to 0.75 g NaCl/l); P2 = water with a salinity of 1.5 PSU (1.5 gm/l); P3 = water with a salinity of 2.5 PSU (2.5 gm/l); and P4 = water with a salinity of 3 PSU (3.0 gm/l). Observations were made on water intake, feed intake, egg production, and egg quality (egg weight, egg shape index density, shell proportion, shell thickness, yolk index, albumen index, and Haugh unit). Results: The results showed that the difference in salinity levels in drinking water from 0.75 PSU to 3 PSU did not affect water intake, feed intake, egg production, or egg quality of Alabio ducks for the first 56 days of the laying period (p > 0.05). Conclusions: It was concluded that Alabio ducks have a good tolerance for drinking water salinity of up to 3 PSU, or equal to 3 gm/l NaCl. [J Adv Vet Anim Res 2022; 9(2.000): 241-245]
Afficher plus [+] Moins [-]Traditional farmers' pig trait preferences and awareness levels toward reproductive biotechnology application in Zambia
2022
Rubaijaniza Abigaba (Department of Animal Science, University of Zambia, Lusaka, Zambia) | Pharaoh Collins Sianangama (Department of Animal Science, University of Zambia, Lusaka, Zambia) | Progress H. Nyanga (Department of Geography and Environmental Studies, University of Zambia, Lusaka, Zambia) | Wilson N. M. Mwenya (Department of Animal Science, University of Zambia, Lusaka, Zambia) | Edwell S. Mwaanga (Department of Biomedical Sciences, University of Zambia, Lusaka, Zambia.)
Objective: This study assessed traditional farmers' preferences for indigenous pigs and their awareness levels toward reproductive biotechnology. Materials and Methods: This cross-sectional, descriptive study employed a mixed-methods con¬current triangulation design with a pragmatic approach. For quantitative data collection, a ran¬domly selected sample size of 622 respondents was interviewed using a structured questionnaire. A semi-structured interview guide was used in seven focus group discussions (FGDs) for qualitative data. For quantitative data, descriptive statistics were used to find out how often something happened, and chi-square tests were used to look for relationships. For qualitative data, thematic analysis was used. Results: The majority (66.9%) of respondents were female, and they had largely (64.8%) attended a primary level of education. A slight majority (43.1%) of the respondents were 30–45 years old. Most respondents (65.1%) were low-income earners (below K500). Incidentally, the majority (74.1%) of respondents had low awareness of reproductive biotechnologies. Respondents' aware¬ness levels were associated with gender (p < 0.001), education (p < 0.001), income (p < 0.01), and not age (p > 0.05). With regard to trait preference, a total of seven indigenous pig traits were reportedly preferred, of which disease resistance (25.9%) and litter size (23.8%) were the most preferred. From FGDs, participants valued indigenous pigs, citing many preferred traits, of which disease resistance and litter size were the most emphasized traits. Some participants were aware of many reproductive biotechnologies and their perceived advantages. However, they were more familiar with artificial insemination, heat detection methods, and synchronization. Conclusions: The majority of respondents had low awareness of reproductive biotechnologies. Respondents' awareness was associated with sociodemographic characteristics. The identified indigenous pig traits preferred by traditional farmers included adaptive and productive traits. [J Adv Vet Anim Res 2022; 9(2.000): 255-266]
Afficher plus [+] Moins [-]Evaluation of the in vitro and in vivo inhibitory effects of Artemisia herba-alba against the growth of piroplasm parasites
2022
Rasha Eltaysh (National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Japan. & Department of Pharmacology, Faculty of Veterinary Medicine, Mansoura University, Mansoura, Egypt) | Mohamed Abdo Rizk (National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Japan. & Department of Internal Medicine and Infectious Diseases, Faculty of Veterinary Medicine, Mansoura University, Mansoura, Egypt) | Shimaa Abd El-Salam El-Sayed (National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Japan. & Department of Biochemistry and Chemistry of Nutrition, Faculty of Veterinary Medicine, Mansoura University, Mansoura, Egypt) | Khaled Abouelnasr (Department of Surgery, Anesthesiology and Radiology, Faculty of Veterinary Medicine, Mansoura University, Mansoura, Egypt) | Abdelnaser Ahmed Abdallah (Veterinary Teaching Hospital, Faculty of Veterinary Medicine, Mansoura University, Mansoura, Egypt) | Ikuo Igarashi (National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Japan.)
Objective: The effect of Artemisia herba-alba methanolic extract monotherapy and combination therapies on the in vitro growth of several Babesia and Theileria parasites in vitro and mice was investigated in this study. Materials and Methods: Fluorescence assay using SYBR Green I stain was used to evaluate the antibabesial efficacy inhibitory of A. herba-alba either in vitro or in vivo. Hematological parameters in the treated mice were analyzed using a Celltac MEK-6450 computerized hematology analyzer. Results: Artemisia herba-alba reduced the growth of Babesia bovis, Babesia bigemina, Babesia divergens, Theileria equi, and Babesia caballi in vitro in a dose-dependent manner. The in vitro inhibitory impact of A. herba-alba on B. divergens and B. caballi cultures was amplified when combined with either diminazene aceturate (DA). In B. microti-infected mice, a combination therapy consisting of A. herba-alba and a low DA dose inhibited B. microti growth significantly (p < 0.05) better than treatment with 25 mg kg−1 DA. Conclusions: These data show that A. herba-alba, when paired with a modest DA dose, could be a promising medicinal plant for babesiosis treatment. [J Adv Vet Anim Res 2022; 9(2.000): 267-274]
Afficher plus [+] Moins [-]The immunity function of rodlet cells in the intestine of Binni fish (Mesopotamichthys sharpeyi)
2022
Abdulkarim Jafar Karim (Department of Anatomy, College of Veterinary Medicine, University of Baghdad, Baghdad, Iraq) | Ali Hussein Hassan (College of Dentistry, University of Sulaimani, Sulaymaniyah, Iraq) | Khalid Hadi Kadhim (Department of Anatomy, College of Veterinary Medicine, University of Al-Muthanna, Al-Muthanna, Iraq) | Khalid Kamil Kadhim (Department of Anatomy, College of Veterinary Medicine, University of Baghdad, Baghdad, Iraq.)
Objective: Rodlet cells produce secretions of glycoproteins in nature. This study investigated the microscopic morphology, histochemical and immunohistochemical reactions, and distribution of the rodlet cells in the gut of Binni fish (Mesopotamichthys sharpeyi). Materials and Methods: Thirty samples were obtained from the cranial, middle, and caudal por¬tions of Binni intestine immediately after being euthanized, fixed in Bouin's solution for 18 h at 24°C, and had undergone routine histological processing, different conventional histochemical stains, and immunostaining with TNF-α and S100 protein antibody. Results: The intestine of Binni fish showed different stages of rodlet cells classified into three distinctive forms: vesicular, granular, and mature cells. Rodlet cells are poorly stained with hema¬toxylin and eosin. Their secretory granules have a weak positive reaction with periodic acid-Schiff (PAS) and Alcian blue (AB), and react positively to combined AB and PAS. Rodlet cells were stained lightly with Safranin O, observed pink in color by Giemsa stain, and showed reactivity to Masson's and Mallory trichrome stains. Rodlet cells were immunostained positively against TNF-α and S100 antibodies, indicating that they have an immune function. Conclusions: Rodlet cells, with their neutral glycoprotein secretions, play a crucial role in the immunity of Binni fish intestine. [J Adv Vet Anim Res 2022; 9(2.000): 282-289]
Afficher plus [+] Moins [-]Fowl typhoid live lyophilized vaccine applied at 3-month intervals protected layer chickens from Salmonella gallinarum infection and prevented cloacal shedding
2022
Taslima Akter (Department of Pathology, Faculty of Veterinary Science, Bangladesh Agricultural University, Mymensingh, Bangladesh) | Mohammed Nooruzzaman (Department of Pathology, Faculty of Veterinary Science, Bangladesh Agricultural University, Mymensingh, Bangladesh) | Sheikh Mohammad Shariful Hoque Belal (Department of Pathology, Faculty of Veterinary Science, Bangladesh Agricultural University, Mymensingh, Bangladesh) | Mustak Ahammed (Department of Pathology, Faculty of Veterinary Science, Bangladesh Agricultural University, Mymensingh, Bangladesh) | ABM Jalal Uddin (Department of Pathology, Faculty of Veterinary Science, Bangladesh Agricultural University, Mymensingh, Bangladesh) | Rokshana Parvin (Department of Pathology, Faculty of Veterinary Science, Bangladesh Agricultural University, Mymensingh, Bangladesh) | Md. Abu Hadi Noor Ali Khan (Department of Pathology, Faculty of Veterinary Science, Bangladesh Agricultural University, Mymensingh, Bangladesh) | Md. Ariful Islam (Department of Microbiology and Hygiene, Faculty of Veterinary Science, Bangladesh Agricultural University, Mymensingh, Bangladesh) | Md. Mokbul Hossain (Department of Pathology, Faculty of Veterinary Science, Bangladesh Agricultural University, Mymensingh, Bangladesh.)
Objective: Here, we developed and tested the efficacy of a vaccination protocol based on a commercially available live attenuated Salmonella enterica serovar Gallinarum (Salmonella galli¬narum) in layer chickens. Materials and Methods: 50 layer chickens of 16 weeks age were obtained and divided into two groups (n = 25), control and vaccinated. The vaccinated group received Salmonella vaccine at 0.2 ml/bird, s/c route at 16, 18, 30, and 42 weeks of age. At 21 weeks of age, birds from both groups were challenged with S. gallinarum orally at 4 × 107 colony-forming unit per bird. Results: Both rapid serum plate agglutination and enzyme-linked immunosorbent assay demonstrated a rising rate of seroconversion in vaccinated birds across the study period, with a 4% positive rate at 18 weeks, 56% at 21 weeks, 60% at 30 weeks, and 64% at each time point of 42 and 54 weeks. The vaccine showed 100% clinical protection and reduced the Salmonella shedding in the feces and eggs of the challenged birds. On the contrary, the unvaccinated challenged birds showed clinical signs and lesions typical of Salmonella infections with morbidity and mortality rates of 36% and 20%, respectively, and had high rates of Salmonella shedding in feces and eggs. Conclusions: With the proposed vaccination schedule Salmonella shedding was prevented, and a high seroconversion was confirmed. To prevent Salmonella infections in laying flocks, a 3-month interval immunization program is advised starting at the pre-laying stage. [J Adv Vet Anim Res 2022; 9(2.000): 301-309]
Afficher plus [+] Moins [-]Evaluation of inhibitor activity of bacterial sialidase from Clostridium perfringens against Newcastle disease virus in the cell culture model using chicken embryo fibroblast
2022
Ryan Septa Kurnia (Doctoral Program in Biomedical Science, Faculty of Medicine, Universitas Indonesia, Jakarta, Indonesia) | Rahajeng Setiawaty (National Veterinary Drug Assay Laboratory (NVDAL), Raya Pembangunan Gunung Sindur, Bogor, Indonesia) | Ketut Karuni Nyanakumari Natih (National Veterinary Drug Assay Laboratory (NVDAL), Raya Pembangunan Gunung Sindur, Bogor, Indonesia) | Christian Marco Hadi Nugroho (Doctoral Program in Biomedical Science, Faculty of Medicine, Universitas Indonesia, Jakarta, Indonesia) | Otto Sahat Martua Silaen (Animal Health Diagnostic Unit, PT. Medika Satwa Laboratoris Kp. Kayumanis, Bogor, Indonesia) | Silvia Tri Widyaningtyas (Institute of Human Virology and Cancer Biology Universitas Indonesia, Jakarta, Indonesia) | Simson Tarigan (Indonesian Research Centre for Veterinary Science, Bogor, Indonesia) | Fera Ibrahim (Department of Clinical Microbiology, Faculty of Medicine, Universitas Indonesia, Jakarta, Indonesia) | Pratiwi Pudjilestari Sudarmono (Department of Clinical Microbiology, Faculty of Medicine, Universitas Indonesia, Jakarta, Indonesia.)
Objective: The Newcastle disease virus (NDV) is an infectious disease that causes very high eco¬nomic losses due to decreased livestock production and poultry deaths. The vaccine's ineffec¬tiveness due to mutation of the genetic structure of the virus impacts obstacles in controlling the disease, especially in some endemic areas. This study aimed to provide an alternative treatment for NDV infection by observing the viral replication inhibitor activity of Clostridium perfringens sialidase in primary chicken embryo fibroblast (CEF) cells. Materials and Methods: The virus was adapted in CEF monolayer cells, then collected thrice using the freeze–thaw method and stored at −20°C for the next step in the challenge procedure. C. perfringens crude sialidase was obtained, but it was further purified via stepwise elution in ion exchange using Q Sepharose® Fast Flow and affinity chromatography with oxamic acid agarose. The purified sialidase was tested for its toxicity, ability to breakdown sialic acid, stopping viral replication, and how treated cells expressed their genes. Results: According to this study, purified C. perfringens sialidase at dosages of 187.5, 93.75, and 46.87 mU effectively hydrolyzes CEF cells' sialic acid and significantly inhibits viral replication on the treated cells. However, sialidase dosages of 375 and 750 mU affected the viability of mono¬layer CEF cells. Interestingly, downregulation of toll-like receptor (TLR)3 and TLR7 (p < 0.05) in the sialidase-treated group indicates viral endocytosis failure. Conclusions: By stopping endocytosis and viral replication in host cells, sialidase from C. perfrin¬gens can be used as an alternative preventive treatment for NDV infection. [J Adv Vet Anim Res 2022; 9(2.000): 335-345]
Afficher plus [+] Moins [-]Anticoccidial effects of Tinospora rumphii extract in naturally infected goats
2022
Pearl Muyco Saladino (College of Veterinary Medicine, University of Southern Mindanao, Kabacan, Cotabato, Philippines) | Elsa Amarille Gonzaga (Department of Veterinary Paraclinical Sciences, College of Veterinary Medicine, University of Southern Mindanao, Kabacan, Cotabato, Philippines) | Loveille Jun Amarille Gonzaga (Department of Chemistry, College of Science and Mathematics, University of Southern Mindanao, Kabacan, Cotabato, Philippines.)
Objective: This study aimed to determine the anticoccidial potential of Tinospora rumphii ethan¬olic stem extract, resulting in an effective reduction in oocysts per gram counts of Eimeria species in goats in comparison to the commercial coccidiostat toltrazuril. Materials and Methods: Eighteen goats that were naturally infected with coccidia were identified as experimental animals. The experimental animals were grouped and were administered a single dose of T. rumphii extract at concentrations of 300, 600, 1,000, and 2,000 mg extract/kg body weight. The fecal samples were collected before treatment, during the first treatment, and every week thereafter for 28 days posttreatment. Fecal examination was carried out using a modified McMaster technique to determine the oocysts per gram of feces, and the mean efficacies of the extracts were calculated. Results: Stem extracts of T. rumphii were able to lower the oocysts per gram count than pre¬treatment for all concentrations, but the efficacy, in general, was still lower than toltrazuril. A significant difference existed in the efficacy of the extracts among the treatments on day 14. Administering 1,000 mg/kg extract resulted in the highest efficacy rate (95.25%) at 14 days post¬treatment and was comparable to that of toltrazuril (89.89%). Conclusion: The results show that the T. rumphii stem extract has the potential to reduce the Eimeria species oocysts per gram counts of naturally infected goats. [J Adv Vet Anim Res 2022; 9(1.000): 8-12]
Afficher plus [+] Moins [-]Detection of antibacterial activity of lactic acid bacteria, isolated from Sumba mare's milk, against Bacillus cereus, Staphylococcus aureus, and Escherichia coli
2022
Maxs U. E. Sanam (Laboratory of Animal Disease and Veterinary Public Health, Faculty of Veterinary Medicine, Universitas Nusa Cendana, Kupang, Indonesia) | Annytha I. R. Detha (Laboratory of Animal Disease and Veterinary Public Health, Faculty of Veterinary Medicine, Universitas Nusa Cendana, Kupang, Indonesia) | Nelsi Kurniawati Rohi (Faculty of Veterinary Medicine, Universitas Nusa Cendana, Kupang, Indonesia.)
Objective: The purpose of this research is to detect the antibacterial properties of lactic acid bacteria (LAB) against pathogenic bacteria. Materials and Methods: Isolation and determination of Lactobacillus spp. Testing of the antibacterial activity of LAB was conducted using filtrate and nonfiltrate forms. The lactic acid bacterial isolates were confirmed to be identified through Gram staining, cell shape, catalase testing, and motility testing. Results: The results of the analysis of the LAB inhibition zone using filtrate and nonfiltrate forms against the bacteria Bacillus cereus were included in the very strong category. The results of the analysis of the LAB inhibitory zone using filtrate and nonfiltrate forms and the agar well method against Staphylococcus aureus bacteria were classified into the very strong category. The results of the LAB inhibitory zone analysis using filtrate and nonfiltrate forms with the well method against Escherichia coli bacteria are included in the very strong category, whereas the results from the LAB inhibitory zone analysis using the filtrate and nonfiltrate forms with the agar diffusion method (disks) are included in the strong category. Conclusion: Based on the results, LAB isolated from Sumba mare's milk displayed antibacterial activity in the strong and very strong categories against pathogenic bacteria such as B. cereus, S. aureus, and E. coli. [J Adv Vet Anim Res 2022; 9(1.000): 53-58]
Afficher plus [+] Moins [-]Influence of arrival weight of Holstein steers of similar age on feedlot growth performance, dietary energetics, and carcass characteristics
2022
Rodrigo Flores (Instituto de Investigaciones en Ciencias Veterinarias, Universidad Autónoma de Baja California, Mexicali, Mexico) | Alejandro Plascencia (Instituto de Investigaciones en Ciencias Veterinarias, Universidad Autónoma de Baja California, Mexicali, Mexico. & Departamento de Ciencias Naturales y Exactas, Universidad Autónoma de Occidente, Guasave, Mexico) | Alberto Barreras (Instituto de Investigaciones en Ciencias Veterinarias, Universidad Autónoma de Baja California, Mexicali, Mexico) | Jaime Salinas-Chavira (Departamento de Nutrición Animal, Facultad de Medicina Veterinaria y Zootecnia, Universidad Autónoma de Tamaulipas, Cd Victoria, Mexico) | Noemí Torrentera (Instituto de Investigaciones en Ciencias Veterinarias, Universidad Autónoma de Baja California, Mexicali, Mexico) | Richard A. Zinn (Department Animal Science, University of California, Davis 95616, CA, USA.)
Objective: Evaluate the effect of arrival weight on feedlot growth performance and carcass characteristics of Holstein steers of similar age. Material and Methods: Three hundred calf-fed Holstein steers (age 113 ± 1-day) were distributed in a completely randomly unbalanced design and divided into five categories (105, 112, 117, 123, and 129 kg) of shrunk initial weight (SIW). Calves were weighed on days 1, 112, 224, and 361. Calves were fed steam-flaked corn-based diets. Growth performance and dietary energy were evaluated for each period and the study as a whole (1–361-day). Results: During the rearing period, average daily gain (ADG) increased (linearly effect, p < 0.01) with increasing birth weight. Birthweight was positively associated (p < 0.05) with feedlot arrival weight (R2 = 0.47) and final harvest weight (R2 = 0.36). Overall ADG increased (p < 0.01) with increasing SIW. Dry matter intake increased linearly during the first 224-day but quadratically during the last 137 days. Overall, there was a quadratic effect (p < 0.05) of SIW on gain-to-feed and observed-to-expected dietary NE, with lower efficiencies (4%) for steers in both the lightest and heaviest SIW. Hot carcass weight, Longissimus muscle area, marbling score, and fat thickness increased (linear effect, p ≤ 0.03) as SIW increased, whereas kidney-pelvic-heart fat and yield-grade were unaffected. Conclusions: The initial arrival weight influences the growth performance, energetic efficiency, and carcass characteristics of Holstein steers of similar age. The effect is more pronounced in the lighter ( [J Adv Vet Anim Res 2022; 9(1.000): 59-65]
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