The effect of calving season on reproductive performance of Jersey cows
| Autor: | Ercan Soydan, Mehmet Kuran |
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| Jazyk: | English<br />Croatian |
| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | Mljekarstvo, Vol 67, Iss 4, Pp 297-304 (2017) |
| Druh dokumentu: | article |
| ISSN: | 0026-704X 1846-4025 |
| DOI: | 10.15567/mljekarstvo.2017.0407 |
| Popis: | Dairy records, containing 1269 lactation record of 462 Jersey dairy cows collected over 16 years, from an agricultural state farm were used. Data for reproductive performance of cows were also collected. Means of the herd for lactation milk yield, calving interval, days open, interval from calving to the first insemination, lactation length, gestation length and dry period were 3195.7±20.2 kg, 366.6±1.7 d, 92.9±1.6 d, 78.0±1.3 d, 301.7±1.1 d, 275.2±0.2 d and 69.3±0.8 d, respectively. The effect of calving season (winter, spring, summer and autumn) on reproductive performance for high, low and moderate milk-yield cows was investigated. Calving season affected the days from calving to first insemination in high and moderate yielding cows (P |
| Databáze: | Directory of Open Access Journals |
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