Influence of prepubertal dietary regimen on mammary growth of Holstein heifers

被引:100
作者
Capuco, AV
Smith, JJ
Waldo, DR
Rexroad, CE
机构
[1] ARS, USDA, INST LIVESTOCK & POULTRY SCI, NUTRIENT CONSERVAT & METAB LAB, BELTSVILLE, MD 20705 USA
[2] UNIV MARYLAND, DEPT ANIM SCI, COLLEGE PK, MD 20742 USA
关键词
milk production; mammary gland; mammary growth; puberty;
D O I
10.3168/jds.S0022-0302(95)76902-8
中图分类号
S8 [畜牧、 动物医学、狩猎、蚕、蜂];
学科分类号
0905 ;
摘要
One hundred-sixteen Holstein heifers (mean BW, 175 kg) were randomly assigned to diets of alfalfa silage or corn silage and were fed to gain approximately 725 or 950 g/d in order to study the influence of prepubertal diet and rate of gain on mammary growth and milk production. Blood was collected before puberty for hormone determination, and 8 heifers per group were killed at puberty for evaluation of tissue variables. Serum growth hormone was reduced, and IGF-I was increased, in the group of heifers reared at a high rate of gain on the corn silage diet. Accompanying the decline in growth hormone, total mammary parenchymal DNA and RNA was reduced in heifers reared at a high rate of gain on the corn silage diet. Mammary parenchyma in heifers of the latter group contained a greater volume of adipocytes and a lower volume of epithelial cells than did mammary parenchyma in heifers of other groups. Data are consistent with previous investigations that showed a deleterious effect of prepubertal rapid weight gain on mammogenesis when accompanied by excess body fat deposition. However, this effect did not cause a decline in subsequent milk production.
引用
收藏
页码:2709 / 2725
页数:17
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