Supplementing Brachiaria mutica with two levels of protein in concentrate fed at 2 rates for mid-lactating cows
2001
Perez, J.A. | Trung, L.T. | Palo, L.P.
Sixteen Holstein x Red Sindhi cows, passed their peak production, were used in a 2 x 2 factorial experiment in a randomized complete block design involving 2 concentrate mixtures (15.5 and 18.6% crude protein) and 2 levels of concentrate feeding (1 kg for every 2 and 2.5 kg milk yield). The feeding trials lasted for 7-day preliminary and 90-day experimental periods. Bachiaria mutica was fed ad libitum. Increasing crude protein from 15.5 to 18.6 percent significantly (P.05) increased milk protein, blood serum protein, and blood urea nitrogen and dry matter (DM) intake in terms of percent body weight. Increasing the level of feeding from 1:2.5 to 1:2 significantly (P.05) increased milk protein blood serum protein and blood urea nitrogen with a corresponding reduction (P0.05) in butterfat of cows in mid-lactation from 4.06 to 3.40 percent. All cows lost weight during the experimental period. No significant differences were obtained in mean weight changes, feed efficiency and income-over-feed cost, although the cows were observed to perform better with higher protein content (8.6% CP) and feeding level (1:2). No significant interactions were observed between protein content and feeding level in the productive parameters studied except for total solids
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