Short communication: Field fertility in Holstein bulls: Can type of breeding strategy (artificial insemination following estrus versus timed artificial insemination) alter service sire fertility?

Journal of Dairy Science
E O S BatistaA H Souza

Abstract

The aim of this study was to compare pregnancy per artificial insemination (P/AI) from service sires used on artificial insemination after estrus detection (EAI) or timed artificial insemination (TAI) breedings. Confirmed artificial insemination outcome records from 3 national data centers were merged and used as a data source. Criteria edits were herd's overall P/AI within 20 and 60%, a minimum of 30 breedings reported per herd-year, service sires that were used in at least 10 different herds with no more than 40% of the breedings performed in a single herd, breeding records from lactating Holstein cows receiving their first to fifth postpartum breedings occurring within 45 to 375 d in milk, and cows with 1 to 5 lactations producing a minimum of 6,804 kg. Initially 1,142,859 breeding records were available for analysis. After editing, a subset of the data (n=857,539) was used to classify breeding codes into either EAI or TAI based on weekly insemination profile in each individual herd. The procedure HPMIXED of SAS was used and took into account effects of state, farm, cow identification, breeding month, year, parity, days in milk at breeding, and service sire. This model was used independently for the 2 types osires f breeding...Continue Reading

References

Oct 1, 1992·Journal of Dairy Science·T A RankinJ R Lodge
Dec 8, 2004·Animal Reproduction Science·J Saumande, P Humblot
Nov 1, 1995·Theriogenology·J R PursleyM C Wiltbank
Apr 19, 2008·Journal of Dairy Science·J M DeJarnetteR W Lenz
May 27, 2008·Theriogenology·R G Saacke
Dec 9, 2009·Reproduction in Domestic Animals = Zuchthygiene·C D HockeyM R McGowan
Nov 3, 2010·Theriogenology·J GosálvezJ F Moreno

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