SEASONAL FERTILITY OF BILLY GOATS
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Date
1995
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COLLEGE OF VETERINARY AND ANIMAL SCIENCES-MANNUTHY,THRISSUR
Abstract
Biweekly data on body weight, scrota! circumference, testicular length
and diameter and weekly data on semen parameters as volume, colour, pH,
consistency, density, sperm concentration, mass activity, initial motility, sperm
abnormality, vitality, metabolism and resistance to hyperosmotic medium of
seven billy goats were observed for a period of one year. The data was
grouped into four pertaining to four seasons aixived at on the basis of a
simultaneously kept daily record of maximum-minimum temperature, humidity
and day length. It was statistically analysed to find out that the differences
between seasons were significant to be attributed to the environmental variables.
Mean body weight, scrota! circumference and testicular length and
diameter were 43.62±1.11 kg, 25.08 +0.12 cm, 8.57+0.07 cm and 5.32+0.03 cm
respectively. There was no significant difference between the seasons except in
testicular diameter and they were foimd to maintain an inverse relationship with
day length and humidity.
Mean volume, pH, initial motility, sperm concentration, total number of
sperm per ejaculate, live sperm per cent, abnonnal spenn per cent, MBR time
and R value were 0.75=0.04 ml, 6.25+0.02, 73.51 ±0.98 per cent, 3600±144
millions/ml, 2660.6 + 133.96 millions, 83.44+0.76, 4.33=0.43, 277.1 ±14.27
seconds and 84.75 ±12.39 ml respectively. There was no significant difference
between seasons in these parameters except pH, initial motility, live sperm
per cent and R value. They were found to have a significant difference between
seasons and were found to maintain either direct or indirect relationship with
humidity and day length.
Semen on extension with milk antibiotic extender and on storage under
relfigeration was found to fast deteriorate rendering it unusable in 24 h.
Semen on the day of collection and extension, was used for artificial
insemination and result of insemination was found to be independent of the
significant or nonsignificant seasonal differences of semen parameters. But,
during the period of smdy, there were two peaks in conception and two peaks
in birth corresponding to it. The pattern appeared to be an adjustment of
reproduction by the female to the varying food availability and climate with
little involvement of the male.
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