The Influence of Milk Yield, Milk Fat, Milk Protein and solids-Not-Fat in Dairy Cows during Early and Peak Lactation Periods on the Conception Rate after Ovulation Synchronization and Fixed-Time Artificial Insemination
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Accession number;06A0478031
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| Title;The Influence of Milk Yield, Milk Fat, Milk Protein and solids-Not-Fat in Dairy Cows during Early and Peak Lactation Periods on the Conception Rate after Ovulation Synchronization and Fixed-Time Artificial Insemination |
| Author;
YAMADA KYOJI
(Nemurochikunogyokyosaikumiai Shibetsukachikushinryosho)
NAKAO TOSHIHIKO
(Yamaguchi Univ., Fac. Agriculture, JPN)
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Journal Title;Journal of the Japan Veterinary Medical Association
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Journal Code:Y0220A
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ISSN:0446-6454
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VOL.59;NO.6;PAGE.389-392(2006)
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| Figure&Table&Reference;TBL.3, REF.11 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;The aim of this study was to examine whether the milk yield, milk fat (MF), milk protein (MP) and solidsnot-fat (SNF) in dairy cows during early and peak lactation periods influence conception rates after ovulation synchronization and fixed-time artificial insemination (Ovsynch/TAI). A total of 287 Holstein-Friesian cows were used for Ovsynch/TAI. The milk yield per day, MF, MP and SNF were investigated one month before and during the month of Ovsynch/TAI. Conception rates after Ovsynch/TAI were 55.7%. Groups of cows showing a decrease in milk yield and an invariable of MP from the previous month at the month of Ovsynch/TAI had a higher conception rate than the corresponding groups of cows showing an increase in milk yield and decrease in MP (P<0.01). Therefore, changes in milk yield and MP during the month before treatment with Ovsynch protocol may influence the conception rate in dairy cows. (author abst.) |
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