effects of partial docking on feedlot performance and body fat characteristics were studied in a fat-tailed sheep breed. thirty-eight male lambs with an average weight of 4.44 ± 0.48 were randomly divided into two groups. the lambs in one group were partially docked at 3-4 h after birth, using rubber rings, and the lambs in another group remained intact (control). after weaning, 20 male lambs f...

Foot-and-mouth disease (FMD) in adult sheep usually causes milder clinical signs than in cattle or pigs, and is often subtle enough to go undiagnosed. In contrast, FMD in lambs has been reported to cause high mortality during field outbreaks. In order to investigate the pathogenesis of FMD in lambs, two groups, aged 10-14 days, were infected with foot-and-mouth disease virus (FMDV) type O UKG. ...

To compare effects of vibratory and mechanical ventilation on fluid balance in the newborn lung, we measured pulmonary arterial and left atrial pressures, pleural and airway pressures, lung blood flow and lymph flow, and concentrations of protein in lymph and plasma of 19 healthy lambs, 2-4 weeks old, during a 2- to 4-hour period of spontaneous breathing, followed by 4-8 hours of mechanical ven...

We conducted an experiment to determine whether early-life social learning of feeding site selection in lambs was sex-specific. Sixteen ewes and their new born lambs were used in a controlled experiment. Eight ewe-lamb pairs included a male lamb and the remaining eight a female lamb. All pairs were individually exposed to an experimental arena containing a safe and unsafe artificial feeding sit...

In the absence of livestock contact, recurring lamb mortality in bighorn sheep (Ovis canadensis) populations previously exposed to pneumonia indicates the likely presence of carriers of pneumonia-causing pathogens, and possibly inadequate maternally derived immunity. To investigate this problem we commingled naïve, pregnant ewes (n=3) with previously exposed rams (n=2). Post-commingling, all ew...

We examined mitochondrial oxidative function 5 minutes and 2 hours after a gradual asphyxial insult in newborn lambs. We subjected 16 ventilated newborn lambs to 75-90 minutes of hypoxia and hypercarbia that resulted in bradycardia and systemic hypotension over the final 15 minutes of the insult. At the end of asphyxia, the lambs were resuscitated and returned to control ventilator settings. Sa...

We conducted this study to determine the level of immunity after vaccination of lambs with whole bodyEchinococcus granulosus. To do so, 200 mature E. granulosus parasites, which were kept in 10% formalinefor 8 months, were obtained from the Department of Parasitology, School of Veterinary Medicine, FerdowsiUniversity of Mashhad. The soluble protein of the parasite was prepared. The sample was h...

Two separate experiments were conducted with sheep‘ grazing Pangola grass pastures. In the first experiment, eight groups of pregnant ewes (six ewes/group) were used. Each group received one of the following supplements, no supplement (control), phosphorus, sodium, iodine, cobalt, mineral mixture, sorghum grain and sorghum grain plus urea. Ewes supplemented with cobalt lost less weight during l...

We suggested that food preference depends on the interplay between flavour and post-ingestive effects, and we predicted that protein-restricted lambs would acquire preferences for foods paired with supplemental sources of N, including urea (Expts 1 and 2), casein (Expt 3), and gluten (Expt 4). In each experiment, twenty lambs, in two groups of ten, were conditioned as follows: on odd-numbered d...