Protein and selenium levels for growing and finishing beef cattle.

نویسندگان

  • F M Byers
  • A L Moxon
چکیده

Two feedlot studies were conducted with 96 Hereford steers to assess the relationship be:ween selenium adequacy and protein requirements of growing and finishing cattle. The first study was a 98-day growing trial with feeder steers as they gained from 230 to 340 kilograms. Diets contained 55% corn silage (dry matter basis) with shelled corn and were supplemented with soybean meal and sodium selenite to provide three levels of protein, each with basal or added selenium. Two lots of eight cattle each were fed each diet. After the growing study, the cattle were reassigned to a ll2-day finishing study (340 to 480 kg) and fed diets including whole shelled corn and 7% corn silage, with basal or added protein as soybean meal or linseed meal with or without supplemental selenium as sodium selenite. In the growing study, cattle fed the three protein levels consumed 676, 858 and 1026 g crude protein/day and gained 1.01, 1.09 and 1.23 kg/day over the 98 days. Feed conversion averaged 5.76, 5.60 and 5.07. Rate (P<.01) and efficiency of growth were improved 23 and 12%, respectively, for cattle fed the 16.5% protein compared to those fed the 11.6% protein diet. Feed intakes were greater (P<.05) for cattle fed 14.1 and 16.5% protein diets than for those fed the 11.6% protein diet. Plasma urea nitrogen increased (P<.O1) with protein level (7.8, 10.7, 15.2 rag/100 ml). Cattle fed each diet responded positively to selenium in rate and efficiency of gain, with the greatest response observed for those fed the lowest protein diet. Plasma selenium levels were marginal for cattle fed basal diets, indicating a deficiency, and increased (P<.01) about twofold with supple-

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عنوان ژورنال:
  • Journal of animal science

دوره 50 6  شماره 

صفحات  -

تاریخ انتشار 1980