Effect of non-genetic factors on longevity traits in Simmental cows
| Autor: | Petrović Milun, Rakonjac Simeon, Bogdanović Vladan, Bogosavljević-Bošković Snežana, Đoković Radojica, Đedović Radica, Petrović Miloš |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Biotechnology in Animal Husbandry, Vol 35, Iss 3, Pp 229-241 (2019) |
| Druh dokumentu: | article |
| ISSN: | 1450-9156 2217-7140 |
| Popis: | The effects of fixed non-genetic factors (farm, season of birth, year of birth, total number of lactations) and a continuous non-genetic factor (age at first conception) on the expression and variability of longevity traits such as age at culling, length of productive life, days in milk and cow efficiency index were investigated in 2548 Simmental cows in three farming areas. Based on the model used for the analysis of the effects of non-genetic factors, including the environment and cow age at first conception, on the expression and variability of longevity traits, the overall means for age at culling, length of productive life, days in milk and cow efficiency index were 2445.21±17.49 days, 1562.55±17.71 days, 1094.17±12.28 days and 58.68±0.32%, respectively. The effect of farming area, year of birth and lactation group on longevity traits was very significant (P0.05). Based on the model used, the coefficients of determination (R2 ) were very significant (P |
| Databáze: | Directory of Open Access Journals |
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