1B.V.Sc., Scholar, Veterinary College and Research Institute, Orathanadu, Tamil Nadu Veterinary and Animal Sciences University-614 625, Thanjavur, Tamil Nadu
2Assistant Professor, Veterinary College and Research Institute, Orathanadu, Tamil Nadu Veterinary and Animal Sciences University-614 625, Thanjavur, Tamil Nadu
3Professor and Head, Veterinary College and Research Institute, Orathanadu, Tamil Nadu Veterinary and Animal Sciences University-614 625, Thanjavur, Tamil Nadu
Department of Veterinary Gynaecology and Obstetrics, Veterinary College and Research Institute, Tamil Nadu Veterinary and Animal Sciences University, Orathanadu - 614 625, Thanjavur, Tamil Nadu
*Corresponding Author's Email: drsatheshkumar6@rediffmail.com
Online published on 12 April, 2023.
Based on the hypothesis that parity and body weight (BW) status of crossbred cows have an influence on the size of their pre-ovulatory follicle (POF), the present study was aimed at documenting the correlation between the diameter of POF with parity and BW of crossbred cattle. A total of 104 crossbred cattle which were diagnosed as oestrus were selected and categorized into three groups viz., Group I: Heifers (n = 22); Group II: Primiparous (n = 28) and Group III: Pluriparous (n = 54). The BWs of all the animals were assessed by indirect method and diameter of POF was measured using ultrasonographic examination on the day of oestrus. The mean diameter of POF ranged between 10.53 - 11.47 mm, which was found to be much smaller than Bos taurus cattle (15 - 18 mm). Even though, the POF diameter increased sequentially with parity, there were no significant differences between the groups. Statistical analysis revealed no significant correlation between the BW of the animal and the POF diameter. Hence, it could be concluded that POF diameter might be related to genetic makeup, nutrition, metabolic status, climate etc., rather than the parity and size of the body.
Body weight, Crossbred cattle, Parity, Preovulatory follicle
