Srinivas B.,Central Sheep and Wool Research Institute Avikanagar |
Srinivas B.,National Dairy Research Institute |
Swain N.,Central Sheep and Wool Research Institute Avikanagar |
Singh N.P.,Central Sheep and Wool Research Institute Avikanagar
Indian Journal of Animal Sciences | Year: 2011
Female lambs, yearlings, pregnant and lactating ewes, 24 each, were randomly divided into 2 equal groups of 12 each. All groups were fed guar straw as basal roughage without (control, CG) and with (experimental, EG) concentrate supplement (CS) consisted 18% total CP and 18 MJ/kg of gross energy. CS offered @25 g/kg W0.75. DM intake was recorded daily and compared with the recommendations of ARC (1998). Metabolism trial was conducted during each physiological stage. CS intake was 20 to 25 g/kg W0.75 with an increase of 1 to 2 g/kg W0.75 with age. DM, N and energy were deficient without CS during all physiological stages. Although CS provided deficit nutrients, efficiency of their utilization was far below the standards (ARC 1998). Purine derivatives excreted in the urine of adult sheep was lesser than lambs or yearlings and ascertained their inverse relationship with body size. Inefficiency in microbial protein production (MBP) without CS, ranged between 25 and 50% compared to optimum production of 30 g/kg apparently digested organic matter in rumen. Performance output index (POI) calculated as function of efficiency indicated 60 to 70% below global standards of optimum performance when fed on guar straw alone. CS increased the POI by 5 and 35% more than optimum level in lambs and pregnant ewes. Performance of yearlings and lactating ewes on CS needed 14 and 50% more improvement to make it comparable with standards.
Maurya V.P.,Central Sheep and Wool Research Institute Avikanagar |
Sejian V.,Indian Veterinary Research Institute |
Kumar D.,Central Sheep and Wool Research Institute Avikanagar |
Naqvi S.M.K.,Central Sheep and Wool Research Institute Avikanagar
Journal of Animal Physiology and Animal Nutrition | Year: 2016
A study was conducted to assess the combined effect of heat stress and nutritional restriction on growth and reproductive performances in Malpura rams. Twenty-eight adult Malpura rams (average body weight (BW) 66.0 kg) were used in this study. The rams were divided into four groups: CON (n = 7; control), HES (n = 7; heat stress), NUS (n = 7; nutritional stress) and COS (n = 7; combined stress). The study was conducted for a period of 2 months. CON and HES rams had ad libitum access to their feed while NUS and COS rams were under restricted feed (30% intake of CON rams) to induce nutritional stress. The HES and COS rams were kept in climatic chamber at 42 °C and 55% relative humidity for 6 h a day between 10: 00 h and 16: 00 h to induce heat stress. Body weight increased significantly (p < 0.05) in CON as compared to NUS and COS. When compared within groups, scrotal width morning, scrotal width afternoon, scrotal circumference morning and scrotal circumference afternoon were significantly (p < 0.05) larger in CON while smaller in COS rams. The higher testicular length was recorded both during morning (p < 0.05) and afternoon (p < 0.01) in COS rams while the lowest in NUS rams. The highest plasma testosterone concentration was recorded in CON and lowest in COS rams. Semen volume and mass motility also differed significantly (p < 0.05) between the groups. The highest semen volume and mass motility was recorded in CON and NUS while lowest in both HES and COS rams. It can be concluded from this study that when two stressors occur simultaneously, they may have severe impact on reproductive performance of rams. © 2015 Blackwell Verlag GmbH.