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Milk production and reproductive performance of cows induced into lactation and treated with bovine somatotropin

Published online by Cambridge University Press:  09 March 2007

M. Mellado ,
E. Nazarre ,
L. Olivares ,
F. Pastor  and
A. Estrada
M. Mellado*
Affiliation:
Department of Nutrition, University Autonoma Agraria Antonio Narro, Saltillo, México
E. Nazarre
Affiliation:
Department of Nutrition, University Autonoma Agraria Antonio Narro, Saltillo, México
L. Olivares
Affiliation:
Department of Nutrition, University Autonoma Agraria Antonio Narro, Saltillo, México
F. Pastor
Affiliation:
Department of Nutrition, University Autonoma Agraria Antonio Narro, Saltillo, México
A. Estrada
Affiliation:
Faculty of Veterinary Medicine and Animal Science, University Autonoma of Sinaloa, Culiacan, Mexico
*
†E-mail: mmellbosq@yahoo.com
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Abstract

Milk production and reproductive performance of pluriparous dairy cows was compared for cows whose lactations were induced by hormonal treatment or followed natural calving. The study was conducted on 179 high-yielding dairy cows in a large dairy operation in a hot arid environment of northern Mexico, where bovine somatotropin (bST) was routinely used in all cows. To induce lactation, 98 cows that had previously failed to become pregnant were treated with 500 mg bST on days 1, 8 and 21. From days 2 to 8, cows were treated with oestradiol cypionate (0·30 mg/kg live weight (LW) per day) and progesterone (0·28 mg/kg LW per day). From days 9 to 15, oestradiol cypionate alone was given. PGF2α was given on day 16. Nothing was administered on days 17 and 18, and 15 mg flumetasone was administered from days 19 to 21. Lactation was induced successfully in all 98 cows subjected to the hormone treatment. All cows received 500 mg bST every 14 days throughout lactation from 63±7 days after lactation had started. Cows with induced lactations produced less (P<0·01) milk per 305-day lactation (9599±1387 kg) than controls (12 302±1245 kg). Proportion of cows pregnant was similar in induced cows and non-treated cows (71 v. 75%). Induction of lactation was associated with increased numbers of services per pregnancy (5·8±4·0 v. 4·22±2·98; P<0·01) compared with controls; however, impaired reproduction might not necessarily have been related to the hormonal treatment to induce lactation, but due to the nature of the cows utilized for this treatment group. This protocol can be used on dairy farms where bST treatment and prolonged steroid administration of dairy cows is legally permitted.

Keywords

dairy cowslactation curvelactation durationmilk yieldpregnancy
Type
Research Article
Information
Animal Science , Volume 82 , Issue 4 , August 2006 , pp. 555 - 559
Copyright
Copyright © British Society of Animal Science 2006

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