The effect of cut, stage of growth and wilting on nitrogenous compounds and protein solubility in grass silages
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Department of Animal Nutrition, Agricultural University of Cracow, Al. Mickiewicza 24/28, 30-059 Kraków, Poland
Publication date: 1992-12-14
J. Anim. Feed Sci. 1992;1(3-4):213-221
Silages were made from two cuts of pasture grass (May-June vs. July), with two stages of growth within each cut (early vs. late) and three extents of wilting (unwilted – about. 21% DM , wilted – 38% DM , strongly wilted – 51% DM). Silages were prepared in laboratory plastic silos containing about 60 kg of unwilted grass. Measured in 48 silages were total-N, protein-N, ADIN, N-NH3 and soluble-N in Wise Burroughs Mineral Buffer. When expressed on a dry matter basis, all of the studied factors had a significant effect on nitrogenous compounds of silages (P < 0.05 or P < 0.01), with the exception of ADIN (P > 0.05) and the effect of wilting on total-N (P > 0.05). On the other hand, when expressed as a percentage of total-N (%N), of all of the factors studied, the extent of wilting caused the greatest changes. The content of protein-N increased (P < 0.01) and soluble-N and N-NH3 decreased (P < 0.01) with increasing DM level. The protein of silages made in July was more soluble (P < 0.05). Soluble-N as a percentage of total N was influenced by the DM content of fresh grass (r = −0.86, P < 0.01) and highly correlated with NPN percentage of total N (r = 0.83, P < 0.01).
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