| Body growth, growth hormone, prolactin and puberty response to photoperiod and plane of nutrition in Holstein heifers. | |
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MedLine Citation:
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PMID: 6643304 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Effects of photoperiod and plane of nutrition on growth, serum concentrations of prolactin (PRL) and growth hormone (GH) and puberty were assessed in Holstein heifers. Sixty pre-pubertal heifers were assigned to one of four treatment groups arranged in a 2 X 2 factorial. The two main effects were photoperiods of 8 h light: 16 h dark (8L:16D) vs 16L:8D, and a low vs high plane of nutrition. Heifers on the low plane of nutrition were fed a diet formulated to achieve a body growth rate of approximately .7 kg/d. Daily feed intake was restricted and similar in both groups of low plane heifers subjected to either 8 or 16 h of light daily. Heifers on the high plane of nutrition were fed ad libitum to achieve a growth rate greater than 1 kg/d. Body weight was recorded every month for 5 mo. The PRL and GH concentrations were measured at d 9, 53 and 132 in serum collected every 30 min for 6 h from five heifers in each treatment group. Progesterone was monitored biweekly in all heifers as an index of puberty (greater than 1 ng/ml). Heifers subjected to 8L:16D-low plane, 16L: 8D-low plane, 8L:16D-high plane or 16L:8D-high plane gained .61, .72, .98 and 1.08 kg/d, respectively. In the same treatment order, averaging across all bleedings, concentrations of PRL were 32, 37, 38 and 46 ng/ml serum, and GH averaged 10.9, 9.3, 9.8 and 9.0 ng/ml serum. Similarly, body weight at puberty averaged 268, 257, 278 and 268 kg, respectively.(ABSTRACT TRUNCATED AT 250 WORDS) |
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Authors:
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D Petitclerc; L T Chapin; R S Emery; H A Tucker |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: Journal of animal science Volume: 57 ISSN: 0021-8812 ISO Abbreviation: J. Anim. Sci. Publication Date: 1983 Oct |
Date Detail:
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Created Date: 1984-01-07 Completed Date: 1984-01-07 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 8003002 Medline TA: J Anim Sci Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 892-8 Citation Subset: IM |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Body Weight* Cattle / physiology* Diet* Female Growth Hormone / blood* Lighting* Prolactin / blood* Seasons Sexual Maturation* |
| Chemical | |
Reg. No./Substance:
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9002-62-4/Prolactin; 9002-72-6/Growth Hormone |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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