Effects of month of breeding on reproductive efficiency of Holstein cows and heifers inseminated with sex-sorted or conventional semen in a hot environment
| Autor: | Leonel Avendaño, Ulises Macías-Cruz, Edgar Sepulveda, José E. García, Miguel Mellado, A. Rodríguez, Francisco G. Véliz |
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| Rok vydání: | 2013 |
| Předmět: |
Male
Hot Temperature Pregnancy Rate animal diseases medicine.medical_treatment media_common.quotation_subject Semen Fertility Biology Insemination fluids and secretions Animal science Food Animals Pregnancy medicine Animals Sex Preselection Mexico Insemination Artificial media_common Artificial insemination medicine.disease Sperm Herd Animal Science and Zoology Cattle Female Seasons Reproduction |
| Zdroj: | Tropical animal health and production. 46(1) |
| ISSN: | 1573-7438 |
| Popis: | The main objective of this study was to assess the effect of month of breeding on reproduction performance of Holstein heifers and cows inseminated with sex-sorted or conventional semen in a hot environment. Pregnancy per artificial insemination (P/AI; 64,666 services over an 8-year period) both in heifers (n = 22,313) and cows (n = 42,353) from a large dairy herd in northern Mexico (26°N) were evaluated with the GENMOD procedure of SAS, with respect to month of AI. Overall, P/AI with sex-sorted semen was greater (P |
| Databáze: | OpenAIRE |
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