Studies on serum progesterone levels in Zebu × Holstein heifers during pre- and peripubertal periods

Balakrishnan, M and Chinnaiya, GP and Nair, PG and Rao, Jagannadha A (1986) Studies on serum progesterone levels in Zebu × Holstein heifers during pre- and peripubertal periods. In: Animal Reproduction Science, 11 (1). pp. 11-15.

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Abstract

The peripheral serum progesterone levels of six normal Zebu × Holstein heifers (75% Holstein inheritance) during the prepubertal period (−150 days) were low (0.23 ± 0.06 ng/ml). They reached maximal values (0.73 ± 0.06 ng/ml) by −45 days (P<0.05 for progesterone values on −90th vs. −45th days) and thereafter decreased to the base level at the time of puberty. The mean (± SEM) age and body weight at puberty of these six heifers were 720 ± 20.70 days and 260.67 ± 8.82 kg, respectively. The serum progesterone levels remained low (0.38 ± 0.17 ng/ml) during early oestrus (up to 28 h) and gradually increased to 2.3 ± 0.84 ng/ml by the 15th day of the cycle.

Item Type:	Journal Article
Publication:	Animal Reproduction Science
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Department/Centre:	Division of Biological Sciences > Biochemistry
Date Deposited:	02 Feb 2010 06:58
Last Modified:	06 Dec 2010 08:20
URI:	http://eprints.iisc.ac.in/id/eprint/21789

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