Energy metabolism with particular reference to methane production in Muzaffarnagari sheep fed rations varying in roughage to concentrate ratio
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چکیده
Methane production in Muzaffarnagari sheep was studied using open circuit respiration calorimetry technique. Twelve rams were divided in three treatment groups of four each and were fed at about maintenance with diets having three roughage (oat hay) to concentrate ratio (R : C), i.e. 92 : 8 (group I), 50 : 50 (group II), 30 : 70 (group III). Concentrate mixture was formulated to contain 93% crushed maize grain, 3.5% wheat bran and 3.5% groundnut cake forti®ed with minerals. Whereas the digestibility of dry matter, organic matter and energy was similar, the digestibility of nitrogen was signi®cantly (p < 0.05) higher in groups II and III and of neutral detergent ®ber (NDF) was signi®cantly (p < 0.05) lower in-group III than the other groups. Nitrogen retention was improved but not beyond 50R : 50C. As a percent of gross energy intake, urinary energy losses in groups I, II and III were 3.0, 2.9 and 2.8%, and methane energy losses were 3.39, 3.34 and 2.98%, respectively. Even though, gross energy intakes (kcal/kg W) were similar, methane loss (g) per 100 g digestible organic matter was signi®cantly (p < 0.05) higher in group I (2.2) than in groups II (1.84) and III (1.54), the latter did not differ in this respect. Metabolisable energy (ME) value (Mcal/kg DM) and energy balances (kcal/kg W) on rations in groups II and III were similar but on ration in group I was signi®cantly (p < 0.05) lower than that in other groups. Ef®ciency of utilisation of ME for maintenance (km) of diets in groups I, II and III calculated as per ARC (1980) were 0.674, 0.688 and 0.693, respectively, and did not differ signi®cantly. Based on the evaluation of three R : C, it was inferred that R : C ratio of 50 : 50 in diet of Muzaffarnagari sheep is Animal Feed Science and Technology
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تاریخ انتشار 2000