Effects of feeding energy or protein supplements before or after calving on performance of spring-calving cows grazing native range.

@article{Marston1995EffectsOF,
  title={Effects of feeding energy or protein supplements before or after calving on performance of spring-calving cows grazing native range.},
  author={T. T. Marston and Keith S. Lusby and Robert P. Wettemann and H. T. Purvis},
  journal={Journal of animal science},
  year={1995},
  volume={73 3},
  pages={
          657-64
        }
}
In three consecutive years, spring-calving Hereford and Hereford x Angus cows (n = 348) were used to determine effects of level of supplemental energy or protein before and after calving on cowherd performance. Beginning on November 1, cows were individually fed 1.22 kg/d of a 40% CP (PROTEIN) or 2.44 kg/d of a 20% CP supplement (ENERGY) until calving. After calving, cows remained on the same supplement, were switched to the other supplement, or were fed 2.44 kg/d of a 40% CP supplement (HI… 

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INFLUENCE OF POST-CALVING SUPPLEMENTAL PROTEIN ON CALF PERFORMANCE AND REPRODUCTIVE EFFICIENCY FOR BEEF COWS FED SILAGE

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Prepartum supplement level and age at weaning: I. Effects on pre- and postpartum beef cow performance and calf performance through weaning.

There was no interaction between level of supplement during late gestation and age at weaning on cow BW, BCS, milk production, AI conception, and overall pregnancy rate in mature beef cows nor in their steer progeny's BW or ultrasound marbling.

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It is suggested that increasing the number of days on a corn-based finishing diet increases insulin resistance in beef cattle and indicates that prepartum maternal dietary energy source can alter fetal adipose tissue development and insulin sensitivity resulting in long-term effects on progeny's intramuscular fat deposition.

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Concentrations of IGF-I and leptin in plasma were constant during 7 wk before the first estrus, indicating that acute changes in these hormones are not associated with the resumption of ovarian function in primiparous beef cows.

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Effect of dietary energy on milk production and metabolic hormones in thin, primiparous beef heifers.

A greater proportion of net energy is partitioned to maternal tissue realimentation when cows receive high compared to low-, maintenance-, or moderate-energy diets.
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