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Zoology and wildlife conservation

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Abstracts » Zoology and wildlife conservation

Influence of endophyte-infected tall fescue on serum prolactin and progesterone in gravid mares

Article Abstract:

Acremonium coenophialum infected tall fescue is not safe for feeding to gestating mares. Regular analysis of blood samples from gravid mares fed with infected tall fescue for 21 days was used to evaluate the effect of the endophyte on plasma prolactin (PRL) and progesterone levels. Mares fed with infected forage were observed to have depressed PRL and progesterone levels even after a thyrotropin releasing hormone administration. The level of PRL normalized shortly after the feeding period and progesterone concentration returned to normal after 10 days. The depressed hormonal levels might be the cause of extended pregnancy and agalactia.

Author: McCann, J.S., Claudle, A.B., Thompson, F.N., Stuedemann, J.A., Heusner, G.L., Thompson, D.L., Jr.
Publisher: American Society of Animal Science
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
Food and nutrition, Progesterone, Mares

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Effects of feeding diets containing endophyte-infected fescue seed on luteinizing hormone secretion in postpartum beef cows and in cyclic heifers and cows

Article Abstract:

An experiment was conducted to determine the effects of feeding diets containing endophyte-infected fescue seed on luteinizing hormone secretion in postpartum beef cows and in cyclic heifers and cows. Endophyte-infected diets produced bovine toxicosis as shown by the decrease in weight gain and basal serum prolactin concentrations. However, endophyte did not affect luteinizing hormone secretion and milk production.

Author: Thompson, F.N., Stuedemann, J.A., Kiser, T.E., Mizinga, K.M.
Publisher: American Society of Animal Science
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
Luteinizing hormone, Cows (Cattle), Cows

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Release of luteinizing hormone after administration of naloxone in pre- and peripuberal heifers

Article Abstract:

A study was conducted to identify the role of naloxone in release of luteinizing hormone (LH) during pre-pubertal and peripuberal development. Fourteen heifers were administered naxolone. Results indicated that opoid system in heifers is functional from prepuberal period to luteal phase of the puertal period. Level of LH concentrations increased following treatment with naxolone.

Author: Bertrand, J.K., Byerley, D.J., Kiser, T.E., Kraeling, R.R.
Publisher: American Society of Animal Science
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
Influence, Puberty, Naloxone, Heifers

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Subjects list: Physiological aspects, Prolactin, Endophytes, Research
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