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

The experiment was conducted to record normative sexual behaviour, libido test along with physico- morphological characteristics of semen in bucks of local goats 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 Gr2, followed by Gr₁ and Gr₃. Irrespective of group sniffing and licking were predominant courtship activities observed. False mounting was higher in Gr₃, followed by Gr₂ and Gr₁. Mounting and number of ejaculation was higher in Gr₁ followed by Gr₂ and Gr₃. The time spent in standing without any mating activities was highest in Gr₃ followed by Gr₂ and Gr₁. Introductory ejaculatory latency (IEL) for Gr₁, Gr₂ and Gr₃ was 0.72± 0.38, 1.75± 0.94 and 6.91± 1.73 min. respectively. The lowest IEL was in Gr₁ followed by Gr₂ and Gr₃. The same trend was observed for 1^st, 2^nd and 3^rd post ejaculation interval (PEI). Mean values was lowest in Gr₂ followed Gr₁ and Gr₃ for 4^th PEI except Gr₃ for 2^nd PEI. 5^th onwards there was no particular trend followed which might be due to less number of males which exhibited the mating (Gr₂). However, the number of bucks which showed the mating was higher in Gr₁. Initial mount latency (IML) for Gr₁, Gr₂ and Gr₃ was 0.20 ± 0.02, 0.31± 0.04 and 0.68± 0.27 min., respectively. However, there was no particular trend observed in Gr₂ and Gr₃. The probable reason for no trend in Gr₂ and Gr₃ was due to inexperienced bucks. Further, the numbers of bucks showed 4^th mating onwards were less. Therefore, Gr₁ showed the increment in the refractory period in a consistent manner except 6^th and 7^th refractory period. Libido score was almost similar in Gr₁ and Gr₂ but it was higher than Gr₃, 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. [ABSTRACT FROM AUTHOR]