Abstract
Effect of genetic line on energy and nitrogen metabolism during late gestation in twin-pregnant ewes fed restrictedly
Highlights
In order to improve performance and slaughter quality of sheep several breeding programmes have been carried out (Givens and Moss, 1994; Ranilla et al, 1998)
Genetic line (GL) and LW did not affect digestibility of dry matter and energy, but apparent protein digestibility was significantly higher in ewes from the Lean compared to the Gain line (81.1 vs 77.9%; P
No significant effects or interactions between LW and genetic line (GL) were observed regarding heat production, nitrogen and energy balances, the latter being negative in all measurements, indicating mobilization of body fat
Summary
In order to improve performance and slaughter quality of sheep several breeding programmes have been carried out (Givens and Moss, 1994; Ranilla et al, 1998). In Denmark we have established 2 genetic lines of Shropshire ewes by mating for several generations either to a ram with high genetic potential for daily weight gain (Gain) or high slaughter quality (high muscle and low fat content, Lean). The effects of such a selection on quantitative nitrogen and energy metabolism have not been investigated. The objective of the present study was to investigate effects of genetic line (GL) on nitrogen and energy metabolism during late gestation of twin-pregnant ewes fed a restricted diet. 418 EFFECT OF GENETIC LINE ON METABOLISM IN PREGNANT EWES
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