Journal article
Effect of Simultaneous Thawing of Multiple 0.5-mL Straws of Semen and Sequence of Insemination on Conception Rate in Dairy Cattle
Journal of dairy science, Vol.87(4), pp.972-975
04/2004
Handle:
https://hdl.handle.net/2376/106084
PMID: 15259231
Abstract
The objectives of this study were to determine 1) the effect of simultaneous thawing of multiple 0.5-mL straws of semen and sequence of insemination (first, second, third, or fourth) on conception rates in dairy cattle, 2) whether the conception rates achieved following AI by professional AI (PAI) technicians and herdsman-inseminators (HI) differed, and 3) the effect of elapsed time from initiation of thawing straws of semen to seminal deposition on conception rates in dairy cattle. Four dairies with PAI and four with HI participated in the study. Initial data recorded included beginning thaw time, cow identification number, and time of seminal deposition. Herd records were retrieved following pregnancy diagnosis. Conception rates of dairy cows (n=1025) were not affected by sequence of insemination (first, second, third, or fourth). Conception rates for herds using PAI were 40, 47, 41, and 50%. Conception rates for herds using HI were 24, 20, 33, and 30%. Average conception rates of dairy cows differed between PAI and HI (45 vs. 27%, respectively). The difference in mean conception rate achieved by PAI and HI was not attributable to milk production, parity, service number or stage of lactation. The elapsed time from initial thaw to completion of fourth AI was shorter for PAI than for HI, 7.6 vs. 10.9min, respectively. Although the average conception rate differed between PAI and HI, elapsed time from initial thaw to completion of fourth AI and sequence of insemination (first, second, third, or fourth) had no effect on conception rate within inseminator group.
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Details
- Title
- Effect of Simultaneous Thawing of Multiple 0.5-mL Straws of Semen and Sequence of Insemination on Conception Rate in Dairy Cattle
- Creators
- J.C Dalton - University of Idaho, Moscow 83843A Ahmadzadeh - University of Idaho, Moscow 83843B Shafii - University of Idaho, Moscow 83843W.J Price - University of Idaho, Moscow 83843J.M DeJarnette - Select Sires, Inc. Plain City, OH, 43064
- Publication Details
- Journal of dairy science, Vol.87(4), pp.972-975
- Academic Unit
- UNKNOWN
- Publisher
- Elsevier Inc
- Identifiers
- 99900547091901842
- Language
- English
- Resource Type
- Journal article