The effect of undegradable crude protein supplementation on milk production and composition and reproduction of early-lactating cows
I. Bruckental 1,   H. Tagari 2,   A. Arieli 2,   S. Zamwell 2,   Y. Aharoni 1,   A. Genizi 3
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Institute of Animal Science, Agricultural Research Organization, The Volcani Center, Bet Dagan 50-250, Israel
Department of Animal Science, The Hebrew University of Jerusalem, Faculty of Agriculture, Rehovot 76-100, Israel
Department of Statistics and Experimental Design, Agricultural Research Organization, The Volcani Center, Bet Dagan 50-250, Israel
Publication date: 1996-04-12
J. Anim. Feed Sci. 1996;5(2):95–106
One hundred and fifty six Israeli-Holstein cows were randomly allotted to two groups in a continuous design; of these, 59 cows entered the trial within 14 days postpartum. The trial lasted 75 days. Diet 1 (control group) contained 16.5% crude protein (CP), of which 11.0% was rumen-degradable (RDCP). Diet 2 (high-protein; HP) contained 17.8% CP; all the additional protein was planned to be rumen-undegradable. Cows were group-fed. Feed intake and milk yield were recorded daily and milk composition was analyzed every 2 weeks. Dry matter intake, milk, milk fat and protein yields (kg/d) of the control and HP treatments were 21.2 and 20.7 (P ≤ 0.05), 34.3 and 35.5 (P ≤ 0.05), 0.866 and 0.935 (P ≤ 0.05), and 0.963 and 1.002 (P ≤ 0.05), respectively. Average milk, milk fat and protein yields in the control and HP cows that entered the trial within 0-21 d after calving, were 37.0 and 39.6 (P ≤ 0.05), 0.992 and 1.043, and 0.985 and 1.056 (P ≤ 0.05) kg/d, respectively. Supplementation of additional undegradable CP at the beginning of lactation, tended to improve reproductive performance, which was attributed to the earlier recovery of body condition score of those cows.
Effect of amount of undegradable crude protein in the diets of high-yielding dairy cows on energy balance and reproduction
I. Bruckental, M. Holtzman, M. Kaim, Y. Aharoni, S. Zamwell, H. Voet, A. Arieli
Livestock Production Science
Effects of dietary undegradable crude protein level on total non-structural carbohydrate (TNC) digestibility, and milk yield and composition of dairy cows
I Bruckental, S Abramson, S Zamwell, G Adin, A Arieli
Livestock Production Science