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Accession number;06A0036851
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| Title;Relationships Between Metabolic Profile Testing During Dry and Early Lactation Periods and Conception Rates after Ovulation Synchronization and Fixed-Time Artificial Insemination in Dairy Cows |
| Author;
YAMADA KYOJI
(Nemurochikunogyokyosaikumiaishibetsukachikushinryosho)
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.1;PAGE.40-44(2006)
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| Figure&Table&Reference;TBL.3, REF.33 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;The aim of this study was to examine whether the nutritional state in dairy cows during dry and early lactation periods impacts the conception rate after ovulation synchronization and fixed-time artificial insemination (Ovsynch/TAI). Fifty-four Holstein-Friesian cows were used. Blood samples were collected twice at 10 d prepartum and 30 d postpartum. Blood parameters such as glucose, nonesterified fatty acids (NEFA), hematocrit (Ht), blood urea nitrogen (BUN) and total cholesterol (Tcho) were determined. Of 54 cows, 39 were used for Ovsynch/TAI, since the other 15 cows were either bred on spontaneous estrus or diagnosed as ketosis, mastitis or endometritis and therefore not used. Conception rates after Ovsynch/TAI were 43.6%. Cows with low levels of glucose and BUN at 30 d postpartum showed lower conception rates after Ovsynch/TAI than cows with normal values (23.5% vs 59.1%, 27.8% vs 61.1%, P < 0.05). These results indicate that low levels of glucose and BUN during early lactation periods influence the conception rates after Ovsynch/TAI. (author abst.) |
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