dc.contributor.author |
Pruitt, R.J. |
|
dc.contributor.author |
Corah, L.R. |
|
dc.contributor.author |
Simms, D.D. |
|
dc.contributor.author |
Spire, M.F. |
|
dc.date.accessioned |
2011-01-27T20:50:18Z |
|
dc.date.available |
2011-01-27T20:50:18Z |
|
dc.date.issued |
2011-01-27 |
|
dc.identifier.uri |
http://hdl.handle.net/2097/7128 |
|
dc.description.abstract |
In six trials involving 486 heifers and 23 bulls, we studied factors
affecting pregnancy rates of estrus-synchronized heifers mated naturally
and evaluated indicators of bull fertility. Heavier heifers and those in
fleshier condition had a higher response to estrus synchronization with
Lutalyse. Heifers serviced more than once did not have higher pregnancy
rates. Pregnancy rates achieved by bulls ejaculating up to 32 times in
2 1/2 days decreased only slightly as the number of ejaculations increased.
There was considerable variation in pregnancy rates and the number of ejaculations
achieved by individual bulls. Sex drive measured by a 3D-minute
serving-capacity test was positively correlated with the number of ejaculations
during the mating period and the number of heifers pregnant per bull.
None of the variables studied could adequately explain the wide variation in
pregnancy rates attributed to individual bulls. |
en_US |
dc.publisher |
Kansas State University. Agricultural Experiment Station |
en_US |
dc.relation.isPartOf |
Cattlemen’s Day, 1982 |
en_US |
dc.relation.isPartOf |
Report of progress (Kansas State University. Agricultural Experiment Station); 413 |
en_US |
dc.subject |
Beef |
en_US |
dc.subject |
Heifers |
en_US |
dc.subject |
Bull fertility |
en_US |
dc.subject |
Lutalyse |
en_US |
dc.title |
Natural mating of estrus-synchronized heifers and
indicators of bull fertility |
en_US |
dc.type |
Conference paper |
en_US |
dc.date.published |
1982 |
en_US |
dc.citation.epage |
82 |
en_US |
dc.citation.spage |
79 |
en_US |
dc.description.conference |
Cattlemen's Day, 1982, Kansas State University, Manhattan, KS, March 5, 1982 |
en_US |