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Scrotal Circumference at Puberty and its Relationship to Testes Mass in Three Genotypes of Beef Cattle

Gazzola, C. and Hill, R.A. and Jeffery, M.R. and O’Neill, C.J. and Reid, D.A. and White, D.H. and Burns, B.M. (2000) Scrotal Circumference at Puberty and its Relationship to Testes Mass in Three Genotypes of Beef Cattle. In: Animal Production for a Consuming World. AAAP-ASAP Conference, 2nd - 7th July, Sydney, Australia.

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Abstract

Scrotal circumference (SC) is a simple, non-invasive measurement commonly used to evaluate bull breeding potential although its validity as a predictor of fertility is questionable (Holroyd, 1998). SC is highly heritable but varies with breed and animal factors such as condition, live weight and age. As an indicator of fertility, recommended SC values range broadly from 30cm to 38cm (Miller, 1992).
It is assumed that SC accurately reflects testes mass (TM) which may be related to direct measures of fertility such as spermatogenesis (Entwistle, 1992). The SC measurements made here test the assumption that SC, used to estimate testes volume (TV), is directly related to TM. Miller (1992) reported a value of 261mm as the SC threshold for puberty. We have studied serial SC measurements so as to devise a more accurate means of using SC to determine puberty.

Item Type:Conference or Workshop Item (UNSPECIFIED)
Additional Information:Reproduced with permission Australian Society of Animal Production [ASAP]. © AAAP 2000. Asian-Australasian Association of Animal Production and Australian Society of Animal Production. Animal production for a consuming world : proceedings of 9th Congress of the Asian-Australasian Association of Animal Production Societies [AAAP] and 23rd Biennial Conference of the Australian Society of Animal Production [ASAP] and 17th Annual Symposium of the University of Sydney, Dairy Research Foundation, [DRF]. 2-7 July 2000, Sydney, Australia.
Keywords:Cattle; Beef; Puberty; Breeding; Live weight;
Subjects:Animal culture > Breeding and breeds
Animal culture > Cattle
Deposited On:15 Mar 2005
Last Modified:13 Aug 2010 15:08

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