dc.contributor.author |
Stevenson, Jeffrey S. |
|
dc.date.accessioned |
2011-07-22T13:53:17Z |
|
dc.date.available |
2011-07-22T13:53:17Z |
|
dc.date.issued |
2011-07-22 |
|
dc.identifier.uri |
http://hdl.handle.net/2097/10738 |
|
dc.description.abstract |
Various programs of estrus synchronization have been tested during the last 6 years to determine the least costly and most efficacious for dairy heifer replacements. Four systems were tested: 1) a modified Ovsynch treatment (GnRH 7 days before PGF2 alpha followed by GnRH either at 24, 30, 33, 40, or 48 hr, with one fixed-time insemination 16 to 20 hr later); 2) a similar protocol that used GnRH 7 days before PGF [subscript]2alpha followed by insemination at estrus (GnRH + PGF [subscript]2alpha); 3) inseminations after one or two injections of PGF [subscript]2alpha given 14 days apart (PGF [subscript]2alpha; heifers not detected in estrus after the second of two PGF [subscript]2alpha injections were given one fixed-time insemination at 72 hr); and 4) two injections of PGF[subscript]2alpha given 14 days apart followed by GnRH at 33 hr, with one fixed-time insemination 16 to 18 hr later (2 x PGF[subscript]2alpha + GnRH). The PGF[subscript]2alpha treatment in which heifers were inseminated after detected estrus following one or two injections of PGF[subscript]2alpha was the least costly for heifers and produced the best measures of fertility. |
en_US |
dc.publisher |
Kansas Agricultural Experiment Station and Cooperative Extension Service |
en_US |
dc.relation.isPartOf |
Dairy Day, 1997 |
en_US |
dc.relation.isPartOf |
Kansas Agricultural Experiment Station contribution; no. 98-100-S |
en_US |
dc.relation.isPartOf |
Report of progress (Kansas Agricultural Experiment Station and Cooperative Extension Service); 792 |
en_US |
dc.subject |
GnRH |
en_US |
dc.subject |
PGF2 |
en_US |
dc.subject |
Estrus synchronization |
en_US |
dc.subject |
Heifers |
en_US |
dc.subject |
Dairy |
en_US |
dc.title |
Various estrus-synchronization programs for heifers |
en_US |
dc.type |
Conference paper |
en_US |
dc.date.published |
1997 |
en_US |
dc.citation.epage |
42 |
en_US |
dc.citation.spage |
40 |
en_US |
dc.description.conference |
Dairy Day, 1997, Kansas State University, Manhattan, KS, 1997 |
|
dc.contributor.authoreid |
jss |
en_US |