日粮组成对牦犊牛消化和能量代谢的影响

日粮组成对牦犊牛消化和能量代谢的影响

董全民;赵新全;施建军;王彦龙;盛丽;杨时海;李世雄;马玉寿;王柳英

【期刊名称】《草业学报》

【年(卷),期】2012(021)003

【摘要】A supplementary strategy and feedlotting method for yak calves was sought as a new approach to alleviate the pressure on natural grasslands and allow recovery of natural vegetation. A 3X3 Latin square test of digestive and metabolic trials was designed in Dawu township of Guoluo Prefecture. Three yak calves per treatment were fed with 3 different diets; (A) 100% Elymus nantus silage, (B) 40% concentrate+60% E. nantus silage, and (C) 60% concentrate +40% E. nantus silage. 1) There were significant differences in digestibility of dry matter, organic matter, crude protein and energy with the different diets, but there was no significant difference for crude ash. With an increase in percentage of concentrate in the diet, the digestibility of every nutrient ingredient in the different diets gradually decreased; 2) The metabolizability of energy for diet C was significantly lower than that for diets A and B, but the efficiencies of digestive energy conversion into metabolic energy (ME/DE) were not significantly different between the 3 diets. The average conversion efficiency was 0.78; 3) Calcium (Ca) extracted from faeces and urine was significantly different between the diets, while phosphorus (P) differed significantly from urine from the