| Postpartum follicular development in Brahman cows under two stocking rates. | |
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MedLine Citation:
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PMID: 19784792 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The aim was to study postpartum follicular population dynamics in Brahman cows in the Mexican humid tropics and under different stocking rates. Lactating adult cows (n = 104) grazed native grammas (Paspalum spp., Axonopus spp.) under two stocking rates: 2.8 (high) or 1.7 (low) cows/ha. Follicle numbers and their size (millimetres) were measured by ovarian ultrasound scanning. Animals detected in oestrus and inseminated were taken out of the study. Both stocking rates produced similar (P < 0.05) body condition scores (BCS) and follicular dynamics. The percent of follicles, averaged over stocking rates, of <4 mm diminished and those of 5-8 mm increased with time, whilst those of >9 mm remained constant; respective values for the previously mentioned sizes were 60 days postpartum (n = 101), 49%, 56% and 5%; 120 days (n = 70), 28%, 66% and 6%; and 180 days (n = 15), 9%, 79% and 12%. There was a positive correlation between BCS and follicle number for size <4 mm (r = 0.73, P < 0.01), whilst for size 5-8 mm, this was negative (r = -0.51, P < 0.05), for follicles >9 mm, no difference was found (r = -0.08, P > 0.05). It was concluded that stocking rate did not affect follicular population dynamics of Brahman cows, but BCS dictated the number and categories of follicles present regardless of the stocking rate utilised. |
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Authors:
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Ivette Rubio; Epigmenio Castillo; Rodolfo Soto; Fernando Alarc?n; Clara Murcia; Carlos S Galina |
Publication Detail:
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Type: Journal Article Date: 2009-09-26 |
Journal Detail:
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Title: Tropical animal health and production Volume: 42 ISSN: 1573-7438 ISO Abbreviation: Trop Anim Health Prod Publication Date: 2010 Mar |
Date Detail:
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Created Date: 2010-02-03 Completed Date: 2010-04-28 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 1277355 Medline TA: Trop Anim Health Prod Country: United States |
Other Details:
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Languages: eng Pagination: 539-45 Citation Subset: IM |
Affiliation:
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Centro de Ense?anza Investigaci?n y Extensi?n en Ganader?a Tropical Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Aut?noma de M?xico, Tlapacoyan, Veracruz, M?xico. ivetterubio@gmail.com |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animal Husbandry* Animals Cattle / physiology* Ecosystem Female Mexico Ovarian Follicle / physiology* Postpartum Period / physiology* Pregnancy |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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