EVALUATION OF SEMEN CHARACTERISTICS AND FERTILITY IN NELLORE SHEEP (JODIPI)
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Date
2014-09
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SRI VENKATESWARA VETERINARY UNIVERSITY TIRUPATI - 517 502. (A.P.) INDIA
Abstract
ABSTRACT :
In this study the semen characteristics immediately after collection, after dilution (0 h) and after chilling the semen at 5⁰C for 24 and 48 h including fertility rates after cervical insemination were studied. The overall mean ejaculate volume, mass activity (0-5 scale), sperm concentration in Nellore Jodipi sheep was 0.62±0.03 ml, 3.98 ± 0.08 and 4037.66 ± 42.75 million per ml, respectively. While, the mean percentage of individual motility, live spermatozoa, normal sperm, head, mid piece and tail abnormalities and intact acrosomes in fresh semen was 70.75 ± 0.53, 63.22 ± 0.48, 93.83 ± 0.30, 1.02 ± 0.11, 0.10 ±0.04, 5.08 ± 0.22 and 95.47 ± 0.20, respectively. The average mean percentage of sperm individual motility, percentage of live spermatozoa, normal spermatozoa, head, mid piece and tail abnormalities and intact acrosomes in Nellore ram semen extended with TCFY dilutor (0 h) was 69.33 ± 0.51, 63.12 ± 0.40, 93.72 ± 0.23, 1.09 ± 0.12, 0.13 ± 0.04, 5.19 ± 0.16 and 95.18 ± 0.14, respectively. The difference in the mean percentage of above parameters between fresh semen and diluted semen at 0 h was not significant (P>0.05). While, the same in chilled semen stored for 24 and 48 h at 5ºC was 57.42 ± 0.63 and 47.33 ± 0.75; 53.7 ± 0.49 and 46.01 ± 0.44; 90.37 ± 0.24 and 87.50 ± 0.25; 1.52 ± 0.08 and 1.99 ±0.10; 0.29 ± 0.68 and 0.55 ± 0.07; 7.81 ± 0.20 and 9.79 ± 0.18 and 88.37 ± 0.30 and 82.18 ± 0.45, respectively and the difference in the mean percentage of these parameters among the diluted semen (0 h) and chilled semen stored for 24 and 48 h was significant (P<0.05). At detected estrus, out of 21 ewes inseminated with diluted semen (0 h), 61.90 % of ewes were not returned to estrus while, 42 (21 each) ewes inseminated with chilled semen stored at 5ºC for 24 and 48 h, 47.62 and 42.86 % of ewes, respectively were not returned to estrus indicating that the spermatozoa are able to maintain their fertilizing ability at 5ºC upto 48 h. Though, the fertility rates are slightly lower in artificially inseminated ewes keeping in view the advantage of availability of superior germplasm to the farmer through AI there is a need to take up further research in these lines so as to enhance the fertility rate.
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