BACKGROUND: Rumen health in ruminants has a great importance because its function has a great deal with milk, meat and fetus production. Many factors can affect the rumen health and destruct its function and performance. OBJECTIVES: this research investigates histopathology lesions resulted from ruminants in the sheep. METHODS: for this purpose, macroscopic examination in 1562 rumens of the slaughtered sheep Sanandaj was done. Among these, 23 rumens has lesions placed in drums of formalin 10% for macroscopic evaluations by means of Hematoxylin and Eosin coloring were referred into the pathobiology lab. RESULTS: in Macroscopic observations, swelling (65.22%), swelling and focal congestion (30.43%) and looming papillary (4.35%) were detected. The highest microscopic signs in the rumen lesions included: sub mucosal edema (32.69%), ruminate eosinophilic (23.07%), parakeratosis (13.46%), granulomatous ruminate (7.69%), watery degeneration and acute purulent ruminate (5.76%). CONCLUSIONS: pathologic lesions of rumen can be due to hyperplasia change in the result of mechanical agitation, stress, parasitic diseases, and mature woody forage.

BACKGROUND: Based on the information no research has been done on the identification and isolation of anaerobic fungi in the Baloochi sheep’s rumen in the dry climate up to now. Objectives: The purpose of this research was the separation and study of the appearance morphology of anaerobic fungi in the Baloochi sheep’s rumen in Sistan region. Methods: The semi-defined medium environment was used in this research for cultivation, separation and purification of anaerobic fungi. Sampling from the solid and liquid contents of 50 Baloochi sheep was done randomly in Zabol slaughterhouse and these samples were used as the source of fungus to inoculation to culture. The roll bottle method was used for purification of rumen fungi. The antibiotic solutions (ampicillin, penicillin, streptomycin, oxytetracycline and chloramphenicol) were used for inhibiting growth of bacteria. Samples of pure fungi were transferred to culture and were observed after growth in glass slide with light microscope. The separated fungi were all monocentric and had rhizoid. Results: With regard to morphologic characteristics the genera of Neocallimastix and Piromyces and species of Piromyces communis, Piromyces minutus, Piromyces rhizinflata, Caecomyces communis was isolated in rumen of Baloochi sheep. Conclusions: With identification of these fungi species in rumen of Baloochi sheep, it is recommended to perform molecular test and enzyme extraction for further survey of characteristics in future research.

Health and ruminal variables were intensively measured during adaptation to grain-based diets in 6 beef cattle with fistulated rumens. The cows had been maintained on prairie grass hay-supplemented diets, and were converted to a grain-based finishing ration by feeding each successive diet (diets 1-4, respectively) for a period of 7 days. Each cow was evaluated and samples were obtained 3 times each day for the first 5 days that each diet was fed. Health variables monitored were rectal temperature, pulse, respiratory and rumen motility rates, fecal consistency, demeanor, blood pH, and blood glucose and L(+) lactate concentrations. Ruminal variables monitored were pH and glucose, DL-lactate, and volatile fatty acid concentrations of rumen contents. Data were analyzed by use of a multivariate ANOVA. We determined that most of the health variables were within reference rang limits throughout the adaptation period; however, analysis of pulse and respiratory rates indicated that diets 2 and 4 were stressful. Although blood pH continually decreased during feeding of the 4 diets (7.38 to 7.30), blood L(+) lactate and glucose concentrations had large increases only within diet 4. The pH of ruminal contents decreased progressively from 6.8 to 5.3. Rumen glucose concentration was low (< 1 micromole/ml), except with diet 4 in which values were 8 times higher than for other diets. By the end of the study, the ruminal contents of all animals were acidic (pH < 5.5), and, on the basis of higher than background amounts of ruminal glucose and DL-lactate, it was determined that rumen microbial equilibrium had not yet been achieved. Analysis of results of this study suggested that ruminal imbalance could be evaluated by monitoring pulse and respiratory rates, blood pH, and blood glucose concentrations. Assessment of the rumen alone could be accomplished by monitoring the variables of rumen pH, rumen glucose, and DL-lactate concentrations.

The effect of feeding monensin, with or without dry hay plus wilted forage, on ruminal formation of 3-methylindole (3MI) was investigated in pastured cattle. Eighty-two cows were allotted to 3 groups. Cows of group-1 served as controls and were given a daily energy supplement (1 kg/head) without monensin for 1 day before and for 7 days after being allowed access to lush pasture. Cows of groups 2 and 3 were given the same daily energy supplement, which also contained monensin (200 mg/kg of supplement). Cows of group 3 also were fed dry hay for 5 days before the start of the study and continued to be given supplemental hay for 4 days after being allowed access to lush pasture containing a layer of wilted forage. Ruminal 3MI and indole concentrations increased on day 1 after all groups were allowed access to lush pasture. By day 7, 3MI concentration in all cows had decreased to pregrazing concentration. Indole concentration did not reach pregrazing concentration until day 10 for cows of groups 1 and 2. Group-3 cows had pregrazing indole concentration on day 7. Ruminal indole concentration did not differ (P > 0.05) between groups 1 and 2. Ruminal indole concentration was lower (P < 0.01) in group-3 cows on all sample collection days, except day 10, compared with that in the other groups. Monensin reduced (P < 0.01) 3MI formation on days 1 and 7 in group-2 cows, compared with group-1 cows. Group-3 cows had lower 3MI concentration than did group-1 cows (P < 0.01) on days -1, 1, 4, and 7. Monensin, when fed with dry hay and wilted forage, reduced (P < 0.01) 3MI formation on days 4 and 7 in group-3 cows, compared with cows that were only given monensin (group 2). Group-3 cows also had lower (P < 0.05) 3MI concentration, compared with group-2 cows on day 1. Results indicated that monensin reduced ruminal formation of 3MI. Feeding dry hay and wilted forage to cattle during the change to lush pasture resulted in further reduction in the amount of 3MI formed by ruminal microorganisms. To maximize the effectiveness of monensin in reducing 3MI formation, dry hay plus wilted forage should be fed to pastured cattle for at least 4 days after they are allowed access to lush pasture.

An experiment was conducted to compare the bioavailability of dl-alpha-tocopherol acetate (TA) with that of dl-alpha-tocopherol nicotinate (TN) when administered to sheep, as a single dose, either into the rumen or the peritoneal cavity. A total of 16 sheep were used in a factorial design, with 4 sheep/treatment at the interaction level. In addition, 5 sheep that received no supplemental alpha-tocopherol, were euthanatized at the end of the trial to provide baseline data for tissue alpha-tocopherol concentrations. Curves were fitted to the plasma alpha-tocopherol concentration values, taken over 180 hours after administration of the esters. Availability of TA was greater than TN, as evidenced by the significantly higher curve parameter values (P < 0.05) and tissue concentrations (P < 0.05). Route of administration had a marked effect on availability of TA (P < 0.001), but not of TN.

Serological diagnosis of brucellosis is still a great challenge due to the infeasibility of discriminating infected animals from vaccinated ones, so it is necessary to search for diagnostic biomarkers for differential diagnosis of brucellosis. Cell division cycle 42 (Cdc42) from sheep (Ovis aries) (OaCdc42) was cloned by rapid amplification of cDNA ends (RACE), and then tissue distribution and differential expression levels of OaCdc42 mRNA between infected and vaccinated sheep were analysed by RT-qPCR. The full-length cDNA of OaCdc42 was 1,609 bp containing an open reading frame (ORF) of 576 bp. OaCdc42 mRNAs were detected in the heart, liver, spleen, lung, kidneys, rumen, small intestine, skeletal muscles, and buffy coat, and the highest expression was detected in the small intestine. Compared to the control, the levels of OaCdc42 mRNA from sheep infected with Brucella melitensis or sheep vaccinated with Brucella suis S2 was significantly different (P < 0.01) after 40 and 30 days post-inoculation, respectively. However, the expression of OaCdc42 mRNA was significantly different between vaccinated and infected sheep (P < 0.05 or P < 0.01) on days: 14, 30, and 60 post-inoculation, whereas no significant difference (P > 0.05) was noted 40 days post-inoculation. Moreover, the expression of OaCdc42 from both infected and vaccinated sheep showed irregularity. OaCdc42 is not a good potential diagnostic biomarker for differential diagnosis of brucellosis in sheep.

Ruminal acidosis is a metabolic disorder that affects ruminants, including cattle, sheep, and goats, due to a pH imbalance in the rumen. The rumen has a diverse population of microorganisms involved in carbohydrate metabolism, with anaerobic microorganisms in the rumen and cecum playing a crucial role. During healthy rumen metabolism, microbial fermentation produces volatile fatty acids, including acetic acid, propionic acid, and butyric acid. Excessive intake of feeds with high soluble carbohydrate content can cause ruminal acidosis by altering the ratio of volatile fatty acids produced through microbial fermentation, which in turn changes the rumen pH. Acidosis is defined as a decrease in the alkalinity of body fluids relative to their acid content. The pH of body fluids may or may not decrease during acidosis, depending on the degree of bicarbonate compensation. Impaired central nervous system function can occur even if blood pH remains stable due to low bicarbonate concentrations, which are buffered by bicarbonate. While a blood pH below 7.35 is required for a clinical diagnosis of acidosis, other clinical signs such as ruminal pH, anorexia, variable feed intake, diarrhea, and lethargy are commonly used to diagnose acidosis in beef cattle.

Objective-To investigate the effects of IV administration of ergotamine and ergovaline and intraruminal administration of ergotamine on electromyographic (EMG) activity of reticuloruminal smooth muscle in conscious sheep. Animals-3 sheep with indwelling electrodes in the musculature of the reticulum and rumen. Procedure-In a crossover design study, reticuloruminal motility before and after IV administration of ergotamine (5, 10, 20, and 40 nmol/kg) or ergovaline (2.5, 5, and 10 nmol/kg) was evaluated; EMG effects were compared with those of corresponding control treatments (IV administration of saline 0.9% NaCl solution or acetone, respectively) in sheep. Ergotamine (800 nmol/kg) or water was also administered intraruminally and their effects compared. Results-After IV administration of ergopeptides, vagally dependent cyclical A and B sequences of contraction of the reticulorumen were immediately inhibited, preceding increases in baseline EMG activity (tonus). The return of cyclical contractions was associated with an increase in contraction amplitude. The effects were dose dependent; administration of 40 nmol of ergotamine/kg resulted in responses that continued for 3 to 4 hours. The effects of intraruminal administration of ergotamine were variable; after 8 hours, EMG activity was increased from baseline for < 2 hours in 1 sheep, 10 hours in another, and > 15 hours in the third. Conclusions and Clinical Relevance-In sheep, the effects of ergotamine and ergovaline on reticuloruminal motility after IV administration and the duration of responses following intraruminal administration suggest that disruption of digestion may occur in animals grazing endophyte-infected pasture that has a high ergopeptide content.

Drug-metabolizing enzyme activities were measured in livers from calves fed commercial milk replacer (nonfunctioning rumen [veal]), and those fed milk replacer supplemented with whole grain and hay from the first week of age (functioning rumen [ruminating calves]). After birth, cytochrome P450 and its NADPH-dependent reductase activities remained unchanged in veal calves; in ruminating calves they increased almost 50%. Cytochrome P450-mediated reactions, such as aniline hydroxylase activity, tripled in ruminating calves, but remained unchanged in veal calves. In both groups of calves, coumarin hydroxylase and 7-ethoxycoumarin 0-deethylase activities increased after birth, but maturation rates and activity values in ruminating calves were considerably greater than those of veal calves. The aminopyrine N-demethylase activity for veal calves was equal to that of calves with functioning rumen. Uridine diphosphoglucuronic acid glucuronyl transferase and glutathione-S-transferase activities also were higher in calves with functioning rumen than in veal calves. This increased activity in calves with functioning rumen probably represents a response to environmental exposure to xenobiotics. Compared with rumen-functional calves, bob veal (0 to 3 weeks old) and fancy veal (15 to 19 weeks old) calves fed commercial milk replacer have a significantly (P = 0.05) diminished capacity for metabolizing drugs and other xenobiotics. From a regulatory perspective, the variance in drug-metabolizing enzyme activities within these different market classes of calves suggests that specific studies designed to determine drug residue-depletion times in veal calves may be needed.