Management of dairy heifers in Uruguay
Effects of feeding level and social environment on prepubertal development
DOI:
https://doi.org/10.31285/AGRO.28.1217Keywords:
puberty, hypothalamic-pituitary-ovarian axis, bodyweight gain, competence, social regroupingAbstract
Management practices during the rearing of dairy heifers should allow an adequate body growth and reproductive development to attain puberty several months before the first conception. Proposed target age and body weight (BW) at first calving for Holstein heifers are between 22-24 months and 82% of mature BW, respectively, for which heifers must conceive at around 15 months of age with 60% of their mature BW. Pre- and postweaning feeding level has effects on feed efficiency, behavior, energy metabolism and body and reproductive development, while social environment during rearing, specifically the social dominance and social regroupings, is known to affect energy metabolism, feeding behavior and body and reproductive development of the heifer. In Uruguay, the information published regarding the management of the dairy heifer is scarce. The aim of this review is to briefly assess the main factors affecting the onset of puberty, and to present an integrative approach of the information generated in Uruguay regarding the effects of modifying the feeding level and social environment during the rearing period on body development, metabolism, and onset of puberty in dairy heifers. In addition, we make a proposal of knowledge gaps that should be addressed in future studies.
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