کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5796071 | 1554383 | 2013 | 6 صفحه PDF | دانلود رایگان |
The heat production (HP) from CH4 and CO2 production and O2 consumption was determined by the respirometry quotient (RQ) method and by C-N balance measurements (CN method). Twelve dry and none pregnant Guirras sheep were fed with 3 diets consisting in the same quantity of alfalfa hay (2Â kg/d offered) and increasing quantities of barley grain (150, 300 and 450Â g/d). The experimental design was completely random with 4 replication by treatment. Fasting HP was determinate in one sheep from each group. Ewes were allocated to individual metabolism cages at thermoneutrality. After 10Â d of adaptation, feed intake, and total fecal and urine output were recorded daily for each ewe during a 5Â d period, as well as BW at the beginning and end of the period. Gas exchange measurements were recorded by open-circuit face mask respirometry system. Average HP measured by RQ method was in agreement with the average HP determined by CN method accounting for 395.6 and 393.4Â kJ/kg0.75Â BW/d, respectively. The metabolizable energy requirement for maintenance (MEm) was estimated by linear regression at 352.3Â kJ/kg0.75Â BW.
Journal: Small Ruminant Research - Volume 109, Issues 2â3, January 2013, Pages 113-118