MILK PRODUCTION OF HOLSTEIN COWS TREATED WITH BOVINE SOMATOTROPIN (bST) UNDER SEVERE HEAT STRESS
An experiment was conducted to evaluate the response of Holstein cows to bST administration, under severe heat stress conditions. Average, maximum and minimum temperatures under the shade, registered during the experiment (June, July and August, 1994) were 41.2 and 24.1 oC, respectively. Sixty nine pregnant cows (average 3.5 parities and 180 days in milk; DIM) were used. Treatments were: a) bST administration, 0 or 500 mg (i.m. injection) every 14 d, during eight weeks, and b) days in milk, 120 - 180 and 180 - 240 days. Effect of treatments and days on treatment (14, 28, 42 and 56) on milk production was measured 3 d after bST was administered. bST treated cows with 120-180 DIM, produced more milk (p
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| Main Authors: | , |
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| Format: | Digital revista |
| Language: | spa |
| Published: |
Colegio de Postgraduados
1997
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| Online Access: | https://www.agrociencia-colpos.org/index.php/agrociencia/article/view/1485 |
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