Relationship of Age at First Calving, First Lactation Milk Yield, Reproductive Performance and Diseases in Simmental Dairy Cows in Turkey

Karslıoğlu Kara N.

PAKISTAN JOURNAL OF ZOOLOGY, vol.54, pp.1-7, 2022 (Journal Indexed in SCI Expanded)

  • Publication Type: Article / Article
  • Volume: 54
  • Publication Date: 2022
  • Doi Number: 10.17582/journal.pjz/20210714120751
  • Page Numbers: pp.1-7


The aim of this research was to determine the relationship between age at first calving (AFC) and first

lactation milk yield [adjusted 305-day (MY305)], reproductive performance [days open (DO), calving

interval (CI)] and diseases (lameness, mastitis, metritis and dystocia) in Simmental dairy cows bred

under Turkey conditions. A total of 1110 Simmental cows (first calving to second calving) were assessed

according to study criteria. While the relation between AFC and disease incidence and MY305 was not

found significant, the relation between AFC and CI and DO was found significant and the optimum

interval of AFC was determined 684≤ İBY≤730 d for minimum CI and DO. Even though relation between

AFC and diseases was not significant, it can be said that the same interval is advantageous for low disease

incidence in Simmental cows. Furthermore, it can be accepted that the same interval is optimum also

for the best lactation milk yield since it was not found a significant relationship among the average

milk yields according to AFC. In conclusion, it can be said that planning the reproductive management

practices according to these results will be beneficial for the optimal balance between economic benefit,

animal health and milk yield.