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Journal of Animal Science, Vol 68, Issue 3 618-623, Copyright © 1990 by American Society of Animal Science

JOURNAL ARTICLE

Value of a molasses mixture containing natural protein as a supplement to brood cows offered low-quality forages

F. M. Pate, D. W. Sanson and R. V. Machen
University of Florida Agricultural Research and Education Center, Ona 33865.

In a 4-yr study, molasses (M; 6% CP), molasses-urea (MU; 17.5% CP; 92% molasses, 4% urea and 4% water) and molasses-cottonseed meal-urea (MCSM; 17.5% CP; 73% molasses, 25% cottonseed meal, 1% urea and 1% water) were compared as winter supplements for Braford cows (514 matings) consuming low-quality forage. Cows were fed 1.35, 1.50 and 1.27 kg.head-1.d-1 of the respective supplements for 127 d beginning in December. Cows were wintered on bahiagrass pasture (avg 8% CP) and stargrass hay (avg 5% CP). Quantity of hay offered averaged 7.6 kg.cow-1.d-1 over 109 d. Cows were exposed to bulls for 90 d beginning on March 1. Supplementation treatment did not affect cow live weight, live weight change or condition score (P greater than .05). However, pregnancy rate was higher (P less than .05) for cows fed MCSM (79.0%) than for cows fed M (67.8%). The pregnancy rate of cows fed MU (76.3%) was intermediate to, but not different (P greater than .05) from, that of cows fed either M or MCSM. Supplementation treatment did not affect calf performance as measured by birth weight, survival rate or weaning weight (P greater than .05). However, calves from cows fed MCSM were 6 d older (P less than .05) at weaning than calves from cows fed M. For 3-yr-old cows, pregnancy rate was considerably higher (P less than .05) for cows fed MCSM (69.6%) than for cows fed M (37.5%).(ABSTRACT TRUNCATED AT 250 WORDS)


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