The present investigation was carried out on 25,499 weekly test day milk yield records of first lactation pertaining to 593 Sahiwal cows spread over 49 years located at National Dairy Research Institute, Karnal, India. The comparison of three lactation curve models viz, quadratic model, gamma type function and mixed log function was made in the present investigation. Mixed log function described the best fit with highest coefficient of determination (97.9%) with lowest value of root mean square error (0.025 kg) value. The peak yield of 8.08 kg in 8thweek of lactation was observed by mixed log function. The closeness of the curves of mixed log function and gamma type function with the observed lactation curve was of the same order of magnitude. The least coefficient of determination (77.8%) was observed in quadratic model with maximum root mean square error (0.081 kg). The gamma type function when compared to mixed log function, explained low peak yield and it is recommended that this function can give best fit for the low yielding cows.

Campylobacter is the commonest reported bacterial cause of infectious intestinal disease. To study the epidemiology of Campylobacter infection among children, 100 stool samples along with patients anamnesis were collected from the clinical diarrheic reported to Enterology unit of Institute for child Health and centre for Children, Egmore, Chennai, Tamil Nadu between May 2013 to June 2013. Samples were subjected to traditional culture and modern PCR techniques, both of which revealed same results of 13% prevalence of Campylobacter sps (8% C.jejuni & 5% C.coli). Analyzing the patients anamnesis to study the epidemiological determinants, sex has a significance (P<0.05). Age and residential area have no significance and summer season and cross contamination could be probable determinants for the infection.

A trial was conducted to assess the influence of different methods of garlic supplementation on the blood profile of crossbred calves. For studying the blood profile, 18 Jersey crossbred calves of both sexes in the age group of 2-3 months were randomly allotted into three treatment groups of 6 calves in each group. Calves in the first group (T1) were supplemented with garlic powder at the dose rate of 250 mg/Kg BW for a period of 150 days in water whereas calves in the second group (T2) were supplemented with 250mg/Kg BW in concentrate feed and the third group (T3) was treated as control. The data on haemogram were collected and analysed as per standard procedures. There was no significant difference between the treatment groups in the values of either haemogram or serum biochemical parameters during experimental period.

Data relating to 130 sows, 19 boars from 400 farrrowings spread over a period from 1984 to 1992 were utilized to study genetic and non-genetic effects in variation of litter size and weight at birth and at weaning. The overall mean litter size at birth (LSB)was 6.83 ± 0.13 piglets. The effects of period, season of farrowings and inbreeding on litter size at birth were not significant (P>0.05).The overall least squares mean of litter size at weaning(LWW) was 4.83 ± 0.12 and was significantly (Pd”0.05) affected by in breeding. Litter weight at birth (LWB) had a least square mean of 7.81 ± .16 kg and it was significantly (Pd”0.05) affected by period of farrowing. The mean LWB of non-inbred sows was 8.22 ± 0.19kg and that of inbred sows was7.41 ± 0.29 kg. The overall least squares mean for litter weight at weaning (LWW) was 39.36 ± 1.25 kg and inbreeding of sow exerted significant effect on LWW. The LWB and LWW were significantly affected by period of farrowing. The litter size at birth and at weaning and litter weight at birth and at weaning was not significantly affected by season of birth. The heritability estimates of litter size at birth and litter size at weaning were 0.096 ± 0.09 and 0.816 ± 0.27 respectively. The corresponding heritability values for LWB and LWW were 0.41 ± 0.18 and 0.53 ± 0.21 respectively. 

Faecal samples of 264 sheep from 4 different sheep farms belonging to three different districts of Karnataka were screened to note the incidence of gastrointestinal nematodes. It was found that 93% of the sheep harboured strongyle infection. The faecal egg counts were found to be light to moderate. The in vitro egg hatch assay was employed to assess the resistance of strongyles in 4 sheep farms. The ED50 value for albendazole ranged between 2.5μg/ml to 6.9 μg/ ml which indicated the resistance of the gastrointestinal nematodes. All the samples were also subjected to another in vitro test, viz., larval development assay. The values ranged between 3-2μg to 4.2μg / ml which also indicated the development of resistance to albendazole. Larval paralysis assay confirmed the development of resistance to albendazole. 

The research was carried out to study the effects of dietary supplementation of Tulasi (Ocimum sanctum) and selenium on ALT and AST enzyme levels in broiler chicken. A total of forty-two broiler chicks of day old divided into six groups of seven each were used for this study. Ocimum sanctum leaf powder (0.25% and 0.5%), organic selenium (0.3 ppm) and their combinations were added to the basal diet. Body weight and feed consumption were recorded at weekly intervals. Blood samples were taken at the end of 6th week for enzymological assay from each treatment. The enzymes assayed were alanine transaminase (ALT) and aspartate transaminase (AST). Dietary supplementation of Ocimum sanctum leaf powder at 0.25%, 0.5% levels and its combination (0.5% level) with selenium (0.3 ppm) reduced the levels of ALT and AST significantly (P<0.05). It was concluded that Tulasi (Ocimum sanctum) has hepato-protective properties.

Punganur breed of cattle in Andhra Pradesh is under the threat of extinction and efforts are being made for conservation, propagation of this breed under in situ conservation. All breedable female animals were bred to Punganur bulls available by natural service. The average birth weights of male and female calves were 10.31 ± 0.43 kg and 10.35 ± 0.75 kg, respectively. The mean height at withers, chest girth ,body length, pin bones width, paunch girth, poll length, tail length, and ear length in male calves  were 45.81 ± 1.05, 46.72 ± 1.34, 43.90 ± 1.29, 7.54 ± 0.73, 45 ± 1.2, 18.09 ± 0.94, 27.45 ± 1.77, 8.54 ± 0.7 cm, respectively. Majority of the calves were born with a mixture of white and brown coat colour, black muzzle, black colour hooves and black switch. The average lactation milk yield was 457.5 ± 81 liters with a lactation length of 153 ± 24 days. The average daily milk yield and peak yield were 3.04 ± 0.16 and 3.90 ± 0.17 liters respectively with an average 5.4 % fat and 9.53 % S.N.F.

A study was conducted to analyse the migratory sheep production system in southern agro-climatic zone of Tamil Nadu. A total of 100 migratory sheep farmers were randomly selected for the study and divided as small (< 175), medium (175- 350) and large (> 350) flocks based on the average flock size for comparison. The migratory tracts were identified based on the results of the enquiry from the sheep farmers, animal husbandry department personnel and by direct identification. A total number of 78 migratory tracts comprising 28 major and 50 minor tracts were identified in the study area. The mean radial distance (km) of migration in major tracts was 317.00±6.21 and minor tract was 148.40±6.21. 

Coagulase negative Staphylococci were considered as commensal organisms or contaminants with limited pathogenic potential. However, they are becoming more frequently associated with nosocomial infections in human and skin infections in animals. In this study, we attempted to isolate and identify the Staphylococci species that causes dermatological infections in dogs. Out of 35 isolates, 27 were identified as S.pseudintermedius and 3 as S.schleiferisubspschleiferi. Among three S.schleiferi isolates, 2 were closely related to S.schleiferi ATCC strain in pta gene sequences.  Methicillin resistant gene (mecA) was not detected in these isolates. All three isolates were susceptible to oxacillin, amikacin, gentamicin and tetracycline, intermediate susceptibility to ceftriaxone and resistant to Penicillin, ampicillin, sulphadiazine. S.schleiferi is an emerging cause of infections in veterinary patients. None of the isolate produced biofilm in microtitre tissue culture plate adherence method. This is the first report of isolation and identification of S.schleiferi from canine skin infections from India. Further studies are needed for early detection and virulence factors of S.schleiferi in the pathogenesis of pyoderma and otitis in dogs.

This experiment was carried out to study the effect of frozen storage on the physico-chemical quality of quail breast meat. Six weeks old broiler quails were collected, slaughtered, dressed hygienically. Quail breast meat samples were collected from dressed carcass which was packed in low density polyethylene pouches taking optimum care to avoid contamination and stored at -18 ± 20 C for 60 days.  Fresh as well as frozen quail breast meat samples were evaluated for physico-chemical and histological changes. Frozen meat samples were analyzed after thawing at 4 ± 10 C for 12 hrs at an interval of 15, 30, 45 and 60 days. It was observed that with advancement of the frozen storage period pH, TBA value, tyrosine value and drip loss increased, whereas moisture, protein, fat and ERV content of quail meat decreased. Pronounced structural changes reported at later part of storage in histological study due to formation of ice crystals in the muscles. It shows that quail meat can be safely stored for 60 days in frozen state without any marked changes.