Consequences of prenatal and preweaning growth for feedlot growth, intake and efficiency of Piedmontese- and Wagyu-sired cattle

被引:23
作者
Cafe, L. M. [1 ,2 ,3 ]
Hennessy, D. W. [1 ,2 ]
Hearnshaw, H. [1 ,2 ]
Morris, S. G. [1 ,4 ]
Greenwood, P. L. [1 ,3 ]
机构
[1] Univ New England, Cooperat Res Ctr Beef Genet Technol, Armidale, NSW 2351, Australia
[2] Agr Res & Advisory Stn, New S Wales Dept Primary Ind, Grafton, NSW 2460, Australia
[3] Beef Ind Ctr, New S Wales Dept Primary Ind, Armidale, NSW 2351, Australia
[4] Wollongbar Agr Inst, New S Wales Dept Primary Ind, Wollongbar, NSW 2477, Australia
关键词
calf; fetal programming; newborn; LONG-TERM CONSEQUENCES; BIRTH-WEIGHT; POSTNATAL NUTRITION; NEONATAL SHEEP; BEEF; PERFORMANCE; YIELD;
D O I
10.1071/EA08089
中图分类号
S8 [畜牧、 动物医学、狩猎、蚕、蜂];
学科分类号
0905 ;
摘要
Consequences of low (mean 28.0 kg, n = 77) and high (mean 38.4 kg, n = 77) birthweight followed by slow (mean 548 g/day, n = 75) or rapid (mean 859 g/day, n = 79) growth to weaning for feedlot growth, intake and efficiency from 26 to 30 months of age were determined in Wagyu x Hereford (n = 81) and Piedmontese x Hereford (n = 73) cattle. Cattle were selected for study based on birthweight and preweaning growth rate, from multi-modal distributions achieved by imposition of low or high maternal nutrition during pregnancy and lactation, with the objective of achieving as close as possible to a 30% difference in birthweight and a 2-fold difference in preweaning growth rate between progeny groups. High birthweight cattle entered the intake test 57 kg heavier, grew 100 g/day more rapidly, and ate 1.0 kg dry matter/day more than the low birthweight cattle. The high birthweight cattle tended to have a higher feed conversion ratio than low birthweight cattle, but net feed intake did not differ due to birthweight group. Cattle grown rapidly to weaning entered the intake test 29 kg heavier, grew at an equivalent rate, and ate 0.7 kg dry matter/day more than the cattle grown slowly to weaning. No differences in feed conversion ratio or net feed intake were observed between the preweaning groups. When assessed at the same liveweight, differences in dry matter intake and/or feed conversion ratio due to birthweight or preweaning growth were no longer apparent. Interactions between prenatal and preweaning growth, or between sire genotype and early-life growth, were not evident for feedlot growth, intake or efficiency. It is concluded that severely restricted growth during prenatal life or from birth to weaning results in cattle that are smaller and consume less feed at the same age as their well grown counterparts; however, long-term effects of growth during early life on efficiency of utilisation of feed are not evident.
引用
收藏
页码:461 / 467
页数:7
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