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Breeding soundness evaluation of young beef bulls

Persson, Ylva (2007). Breeding soundness evaluation of young beef bulls. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2007:18
ISBN 978-91-576-7317-6
[Doctoral thesis]

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The overall aims were to learn more about factors affecting fertility in Swedish beef sires in general and in yearling beef bulls in particular, focusing mainly on sexual maturity and hind limb health finding useful tools in order to be able to routinely perform a complete bull breeding soundness evaluations in Swedish beef bulls. Semen was collected from yearling beef bulls, postmortem, and the sperm morphology was evaluated. Using a strict definition, based on sperm morphology, we could demonstrate that less than half the number of the bulls was considered sexually mature at 12 months of age. Samples collected by transrectal massage were compared with the two most commonly used collection methods; artificial vagina and electroejaculation, and with samples collected by cauda epididymal dissection postmortem. Sperm morphology in semen collected by transrectal massage was as representative as in samples collected by artificial vagina and electroejaculation and to some extent also in those collected postmortem. However, reduction in volume, concentration and motility would need to be considered, especially if semen is collected outdoors under suboptimal conditions. In conclusion, the transrectal massage technique is a very useful semen collection method in the field when no other collection method is possible, thus enabling a complete bull breeding soundness evaluation. Femorotibial, femoropatellar (stifle), tarsocrural, talocalcaneus, and proximal intertarsal joints from young beef sires with impaired fertility, but no signs of lameness, were examined postmortem regarding the presence of joint lesions. A majority of the bulls had severe, bilateral lesions referred to as osteoarthritis secondary to osteochondrosis dissecans. We think that the osteoarthritis present in the hind limbs must have contributed to the infertility, rendering the bulls difficulties in mounting. The fact that most of the lesions were bilateral, could explain the absence of clinical lameness. The results of this study indicate that the poor fertility reported in these beef bulls can be a result of joint problems, secondary to osteochondrosis. Thus, joint lesions should always be taken into consideration as a contributory cause of reproductive failure in beef sires with or without symptoms of lameness.

Authors/Creators:Persson, Ylva
Title:Breeding soundness evaluation of young beef bulls
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :April 2007
Number of Pages:44
ALLI: Persson, Y. & Söderquist, L. (2005). The proportion of beef bulls in Sweden with mature spermiograms at 11 to 13 months of age. Reproduction in Domestic Animals 40, 131-135. II: Persson, Y., McGowan, M. & Söderquist, L. (2006) Comparison between the sperm morphology in semen samples obtained from yearling beef bulls by transrectal massage of the ampullae and cauda epididymal dissection. Reproduction in Domestic Animals 41, 233-237 III: Palmer, CW., Brito, LFC., Arteaga, AA., Söderquist, L., Persson, Y. & Barth, AD. (2005) Comparison of electroejaculation and transrectal massage as methods of semen collection in range and yearling feedlot bulls. Animal Reproduction Science 87, 25-31. IV: Persson, Y., Strid, G., Håård, M. & Söderquist, L. (2007). Collection of semen in beef bulls - transrectal massage vs. artificial vagina. The Veterinary Record (accepted) V: Persson, Y., Söderquist, L. & Ekman, S. Joint disorder; a contributory cause to reproductive failure in beef bulls? (Manuscript)
Place of Publication:Uppsala
ISBN for printed version:978-91-576-7317-6
Publication Type:Doctoral thesis
Full Text Status:Public
Agrovoc terms:cattle, beef cattle, bulls, calves, sexual maturity, animal morphology, animal breeding, semen, spermatozoa, semen collection, osteochondritis, joint diseases, ejaculation, reproductive performance, reproductive disorders, sweden
Keywords:Bos Taurus, sexual maturity, sperm morphology, semen collection, transrectal massage, joint, osteochondrosis, osteoarthritis, artificial vagina, electroejaculation
Permanent URL:
ID Code:1374
Department:(VH) > Dept. of Clinical Sciences
Deposited By: Ylva Persson
Deposited On:10 Apr 2007 00:00
Metadata Last Modified:02 Dec 2014 10:11

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