Growth targets and rearing strategies for replacement heifers in pasture-based systems: a review
J. R. Roche A E , N. A. Dennis B , K. A. Macdonald A , C. V. C. Phyn A , P. R. Amer B , R. R. White C and J. K. Drackley D
+ Author Affiliations
- Author Affiliations
A DairyNZ, Cnr Ruakura and Morrinsville Road, Hamilton 3240, New Zealand.
B Abacus Bio Ltd, 442 Moray Place, Dunedin 9016, New Zealand.
C Department of Dairy Science, Virginia Tech, Blacksburg, VA 24061, USA.
D Department of Animal Sciences, University of Illinois, Urbana, IL 61801, USA.
E Corresponding author. Email: john.roche@dairynz.co.nz
Animal Production Science 55(7) 902-915 https://doi.org/10.1071/AN14880
Submitted: 16 October 2014 Accepted: 7 January 2015 Published: 1 June 2015
Abstract
Dairy heifer growth and liveweight at first calving are regarded as important management variables affecting profitability and animal welfare. However, the appropriateness of heifer growth rate targets for different farming systems is not clear. Retrospective assessments of the association between heifer liveweight and subsequent productivity indicate significant benefits in milk production and, even, reproduction from increasing liveweight at breeding and first calving. However, prospective interventionist experiments do not concur, with very variable effects of liveweight at breeding on milk production and with only limited evidence of a positive effect of first-calving liveweight on first-lactation milk yield. In addition, any benefit in the first lactation is not evident in subsequent lactations in the limited number of long-term studies reported. Pre-weaning nutrition and average daily weight gain are areas of increasing interest, with lifelong increases in milk production resulting from accelerated growth rates during the first 8 weeks of life, indicating a possible significant return from a short-term investment. This could be one reason for the inconsistent effects of heifer liveweight at breeding and first lactation on milk production. Although the effect of pre-weaning average daily gain on heifer liveweight is short-lived, a recent meta-analysis indicated that pre-weaning average daily gain explains 22% of the variation in first-lactation milk production. Whether these differences in animal physiology have relevance in grazing systems, wherein heifers and cows do not consume sufficient nutrients to reach their potential, requires investigation. Despite considerable extension efforts over successive decades, current evidence indicates that failure to provide the new-born calf with sufficient high-quality colostrum is common. To understand the reasons for suboptimal colostrum feeding requires social research, with appropriate extension strategies developed to elicit practice change. Although there can be little doubt regarding the importance of heifer rearing to the profitability and sustainability of the farming business, the collective literature points to a failure of retrospective analyses in determining the cause of poor heifer performance. In reality, it is likely to be a combination of factors. The objective of this review is to investigate the effect of liveweight gain at various stages of the growth cycle of the heifer on the milk-production capacity of the lactating animal.
Additional keywords: calf, compensatory growth, heifer management, liveweight targets.
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