1Livestock Production & Management Section, Indian Veterinary Research Institute, Izatnagar, Bareilly, Uttar Pradesh, India
2Division of Livestock Production Management, GBPUA&T, Pantnagar, Uttarakhand, India
3Division of Livestock Production Management, GADVASU, Ludhiana, Punjab, India
4Division of Livestock Production Management, National Dairy Research Institute, Karnal, Haryana, India
*Corresponding author: LS Devi; Email: thoibi.suniti@gmail.com
Online published on 15 June, 2017.
The present study was carried out in U. S. Nagar district of Uttarakhand on Frieswal heifers reared by farmers under 5 AI centres, and aimed to study early reproduction traits of Frieswal heifers and factors affecting them. The study revealed that the Least-squares means for age at puberty, age at first artificial insemination and age at first conception were 485.2 ± 21.8 (n=131), 608.3 ± 27.1 (n=81) and 610.2 ± 25.2 (n=77) days. Average age at first calving was 807.0 ± 28.1 (n=18) days. The non-genetic factors like education of farmers, herd size, season, year, and artificial insemination centre had significant effect on reproductive performance traits. Significant effects of artificial insemination centre, year of birth, education level, herd size and season of birth on age at puberty; of artificial insemination centre on age at first artificial insemination; of year of birth on age at first artificial insemination; of artificial insemination centre on age at first conception were recorded.
Age at puberty, age at first AI, Age at first conception, Frieswal heifers, non-genetic factors
