Seasonal effect on sexual behaviour of Kankrej bull

Abstract

Studies on sexual behaviour as such, and the documented reports on the influence of seasons on these characteristics are scanty for Kankrej bulls. These indices could be successfully used in selection and culling of Kankrej bulls in the breeding programs. Hence, a study on sexual behaviour of Kankrej bull was carried out at the Semen Processing Unit; with the objective to study the seasonal effect on sexual behaviour traits of Kankrej bulls. The period of investigation was divided into three season viz., summer, monsoon and winter. Eight healthy Kankrej bulls of 4-5 years of age were selected. Weekly once semen collection was done for each bull, but only fortnightly observations of semen collection were recorded and eight collections in a season for each bull, 64 from each season and total of 192 collections, were evaluated. The mean values for different sexual behaviour traits were; temperament score (0-5 scale) 1.96±0.02, libido score (0-9 scale) 6.20±0.12, erection score (0-4 scale) 3.36±0.04, protrusion score (0-4 scale) 2.90±0.02, intensity of thrust (0-4 scale) 3.42±0.06, reaction time 112.20±5.09 seconds, total time taken to successful mount 165.68±6.53 seconds and Flehmen reaction (0-1 scale) 0.49±0.04. Libido was significantly (P<0.05) higher in June (7.31±0.35) and July (7.25±0.41) months, as compared to rest of the months. Significantly lower libido was observed in October (5.31±0.45) and November (5.13±0.34) months. Libido score was significantly (P<0.05) higher during summer (6.70±0.18) season as compared to winter (5.70±0.19). However, libido score during monsoon (6.20±0.23) was non-significant with both summer and winter seasons. Seasonal variation was non significant for other sexual behaviour traits viz., temperament, erection, protrusion, intensity of thrust, reaction time, total time taken to successful mount and Flehmen reaction. Positive correlation was observed between libido score and reaction time; erection score with protrusion score and intensity of thrust; protrusion score with intensity of thrust and reaction time with total time taken to successful ejaculation. It was concluded that, Kankrej bull have good sexual behaviour throughout the year, however, sexual behaviour was more intensive in summer months.

Seasonal Variation in Sexual Behaviour of Deoni (Bos indicus) Bulls

“…The results of the present study are in agreement with the report (Mahmood et al, 2013) in Cholistani artificially inseminated bulls (autumn-3.49±0.07, winter-3.50±0.07, dry summer-3.47±0.07 and wet summer-3.48±0.08). On the contrary, Deka et al (2019) observed the significant effect in Kankrej bulls (summer-6.70±0.18, monsoon-6.20±0.23 and winter-5.70±0.19), Solanki et al (2019) in Gir bulls (summer-The overall dismounting time (seconds) in Deoni bulls was 2.51±0.07. The finding of the present study is in agreement with the report of Reddy and Sasikala (2013) in Jersey  Sahiwal crossbred bulls (2.67±0.15).…”

“…Fertility is one of the important aspects of bull's performance for preservation of its germplasm (Naha et al, 2017). The requirement for frozen semen from superior indigenous bulls is increasing rapidly in India over the recent years due to their better milk quality, adaptability to hard climate and acceptability to poor quality feed and fodders resources (Deka et al, 2019). To achieve the required target of superior frozen semen with better fertility breeding soundness evaluation of bulls is crucial, for which sexual behavior of breeding bulls must be studied (Solanki et al, 2019).…”