THE USE OF SHEEP AS A MODEL TO PREDICT THE RELATIVE INTAKES OF SILAGES BY DAIRY-CATTLE

被引:12
作者
CUSHNAHAN, A [1 ]
GORDON, FJ [1 ]
FERRIS, CPW [1 ]
CHESTNUTT, DMB [1 ]
MAYNE, CS [1 ]
机构
[1] QUEENS UNIV BELFAST,BELFAST,ANTRIM,NORTH IRELAND
来源
ANIMAL PRODUCTION | 1994年 / 59卷
关键词
COWS; FOOD INTAKE; SHEEP; SILAGE;
D O I
10.1017/S0003356100007935
中图分类号
S8 [畜牧、 动物医学、狩猎、蚕、蜂];
学科分类号
0905 ;
摘要
A study was carried our to determine if sheep could be used as a model for predicting the intakes of silages by cattle. Fifty ewes and 45 cows were offered five grass silages unsupplemented in two parallel randomized-block experiments over a 4-week period. Each silage had been made using the same equipment over a range of cutting dates (May July, August 1991). The silages differed in fermentation characteristics, with lactic acid concentrations varying from 15.3 to 90.7 8/kg dry matter, and ammonin-nitrogen concentrations from 77 to 198 g/kg nitrogen. When expressed on a metabolic live-weight basis, the mean intakes of silages silages by cows were 2.25 times those of the sheep, with the mean intakes being 35.1 and 79.1 g/kg M(0.75) for the sheep and cows respectively. However, there was no significant correlation between recorded intakes during the 4th week of the study by the two species (y (cows) = 0.62x (sheep) + 58.40; r(2) = 0.03). It was concluded that sheep were not a useful model system to predict the intakes of a range of grass silages of similar chop length by dairy cows.
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页码:415 / 420
页数:6
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