Live Weight and Bone Growth from Birth to 23 Months of Age in Holstein–Friesian, Jersey and Crossbred Heifers

Q2 Agricultural and Biological Sciences Dairy Science & Technology Pub Date : 2022-05-13 DOI:10.3390/dairy3020026
M. Gibson, Brooke R. Adams, P. Back, R. Hickson, K. Dittmer, C. Rogers
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引用次数: 1

Abstract

Selection pressure for greater milk solid production, calving ease and early puberty attainment has resulted in the alteration of the growth trajectory of New Zealand dairy heifers. Although previous data have looked at stature growth in terms of height and girth, changes in the growth trajectory as a result of seasonal growth has not been examined. In addition, the relative contributions of the appendicular skeleton and thorax in relation to height have not been considered in previous studies. Therefore, the aim of this study was to examine how the proportional contributions of stature change with increases in live weight in Holstein–Friesian, Jersey and Holstein–Friesian–Jersey crossbred heifers from birth to 23 months of age (just prior to calving). Comparisons of height, length, girth and distal and proximal forelimb length (stature) revealed that at the same live weight, measures of girth, length and height did not differ between breeds (p < 0.05). As live weight increases, the relative contribution of the distal limb to increasing height decreases, which is consistent with the cessation of physeal growth occurring earlier in the bones of the distal limb than in the proximal limb. By understanding the timing of proximal and distal growth in dairy heifers, the effect of seasonal growth on longitudinal bone growth can be identified.
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荷斯泰因-弗里西亚、泽西和杂交小母牛出生至23月龄的活重和骨生长
更高的乳固体产量、产犊容易度和早熟的选择压力导致了新西兰奶牛生长轨迹的改变。虽然以前的数据已经从身高和周长的角度研究了身高的增长,但由于季节性增长而导致的增长轨迹的变化尚未得到检验。此外,在以前的研究中没有考虑到尾骨和胸的相对贡献与身高的关系。因此,本研究的目的是研究荷斯泰因-弗里西亚、泽西和荷斯泰因-弗里西亚-泽西杂交小母牛从出生到23个月龄(刚产犊前)身高随活重增加的比例变化。高、长、围和前肢远、近端长度(身高)的比较表明,在相同活重下,不同品种之间的围、长、高测量值无显著差异(p < 0.05)。随着活重的增加,远端肢体对身高增加的相对贡献减小,这与远端肢体骨骼停止骨骺生长的时间早于近端是一致的。通过了解奶牛近端和远端生长的时间,可以确定季节性生长对纵向骨生长的影响。
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来源期刊
Dairy Science & Technology
Dairy Science & Technology 农林科学-食品科技
CiteScore
2.30
自引率
0.00%
发文量
0
审稿时长
2 months
期刊介绍: Information not localized
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