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Journal of Animal Science, Vol 73, Issue 1 63-68, Copyright © 1995 by American Society of Animal Science

JOURNAL ARTICLE

Effects of postweaning diet on age and weight at puberty and mild production of heifers

T. T. Marston, K. S. Lusby and R. P. Wettemann
Department of Animal Science, Oklahoma State University, Stillwater 74078.

One hundred 7-mo-old spring-born beef heifers (215 kg) were used to evaluate effects of level of supplementation and short-term concentrate feeding on age and weight at puberty and milk production. In each of two winters, heifers were individually fed .9 kg/d of a 40% CP supplement (SBM) or 1.8 or 2.7 kg/d of a 20% CP supplement (LOW-20 or HIGH-20, respectively) while grazing dormant native pastures or .9 kg/d of SBM until February, and then fed a high-concentrate diet (NEg = 1.31 Mcal/kg) in drylot to weight the same as HIGH-20 heifers on May 1, the beginning of the breeding season. Weights on May 1 were similar for HIGH-20 and DRYLOT heifers (320 and 314 kg, respectively) and were heavier (P < .01) than those of LOW-20 heifers (289 kg), which were heavier (P < .01) than SBM-fed heifers (278 kg). Pubertal weight was similar for SBM, LOW-20, and DRYLOT (290, 296, and 297 kg, respectively) and heaviest for HIGH-20 heifers (P < .01, 325 kg). DRYLOT heifers reached puberty at 29 d younger (P < .05) than heifers on the other treatments. Percentage of heifers puberal on May 1 were 0, 9, 13, and 72 for SBM, LOW-20, HIGH-20, and DRYLOT heifers, respectively. Pregnancy rates were significantly lower for SBM (67%) than for LOW-20, HIGH-20, and DRYLOT (94, 94, and 86%, respectively). Milk production after first parturition was similar for all treatments. Age and weight at puberty may be altered by short-term feeding of high-concentrate diets.(ABSTRACT TRUNCATED AT 250 WORDS)


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Copyright © 1995 by the American Society of Animal Science.