STUDY ON BUCK'S MATING BEHAVIOUR, LIBIDO SCORE AND SEMEN BIOLOGY IN LOCAL GOAT OF ROHILKHAND REGION, INDIA

摘要

The experiment was conducted to record normative sexual behaviour, libido test along with physico- morphological characteristics of semen in bucks of local goat's maintained at sheep and goat unit, Indian Veterinary Research Institute Izatnagar Bareilly. Available bucks were categorized in to Group I: Experienced (2yrs), Group II: Non experienced Adolescence (1 year), Group III: Pubertal (6 -12 months). Six males from each group utilized for the normative sexual behaviour. Each male was observed 3 times for recording sexual behaviour for 30 min. Semen collection using artificial vagina was done using bucks from group II. Mean time spent in licking and vocalization was higher in Gr(2), followed by Gr(1) and Gr(3). Irrespective of group sniffing and licking were predominant courtship activities observed. False mounting was higher in Gr(3), followed by Gr(2) and Gr(1). Mounting and number of ejaculation was higher in Gr(1) followed by Gr(2) and Gr(3). The time spent in standing without any mating activities was highest in Gr(3) followed by Gr(2) and Gr(1). Introductory ejaculatory latency (IEL) for Gr(1), Gr(2) and Gr(3) was 0.72 +/- 0.38, 1.75 +/- 0.94 and 6.91 +/- 1.73 min. respectively. The lowest IEL was in Gr(1) followed by Gr(2) and Gr(3). The same trend was observed for 1st, 2nd and 3rd post ejaculation interval (PEI). Mean values was lowest in Gr(2) followed Gr(1) and Gr(3) for 4th PEI except Gr(3) for 2nd PEI. 5th onwards there was no particular trend followed which might be due to less number of males which exhibited the mating (Gr(2)). However, the number of bucks which showed the mating was higher in Gr(1). Initial mount latency (IML) for Gr(1), Gr(2) and Gr(3) was 0.20 +/- 0.02, 0.31 +/- 0.04 and 0.68 +/- 0.27 min., respectively. However, there was no particular trend observed in Gr(2) and Gr(3). The probable reason for no trend in Gr(2) and Gr(3) was due to inexperienced bucks. Further, the numbers of bucks showed 4th mating onwards were less. Therefore, Gr(1) showed the increment in the refractory period in a consistent manner except 6th and 7th refractory period. Libido score was almost similar in Gr(1) and Gr(2) but it was higher than Gr(3), which differed significantly (P < 0.05). The average volume, concentration, live and abnormal sperm by local goat was 0.42 +/- 0.03 ml., 2782.78 +/- 191. 22 million/ml, 87.21 +/- 0.92 % and 3.53 +/- 0.5% respectively.