Open Access
Research
(Published
online: 27-02-2016)
19.
Effect of extended photoperiod during
winter on growth and onset of puberty in Murrah buffalo heifers
-
Ashwani Kumar Roy, Mahendra Singh, Parveen Kumar and B. S.
Bharath Kumar
Veterinary World, 9(2): 216-221
doi:
10.14202/vetworld.2016.216-221
Ashwani Kumar Roy:
Division of Dairy Cattle Physiology, National Dairy Research
Institute, Karnal, Haryana, India; royashwani@gmail.com
Mahendra Singh:
Division of Dairy Cattle Physiology, National Dairy Research
Institute, Karnal, Haryana, India; chhokar.ms@gmail.com
Parveen Kumar:
Division of Dairy Cattle Physiology, National Dairy Research
Institute, Karnal, Haryana, India; drpk1959@gmail.com
B. S. Bharath Kumar:
Division of Dairy Cattle Physiology, National Dairy Research
Institute, Karnal, Haryana, India; bharath.kumar.vet@gmail.com
Received: 17-08-2015, Revised: 08-01-2016, Accepted: 16-01-2016,
Published online: 27-02-2016
Corresponding author:
Ashwani Kumar Roy, e-mail: royashwani@gmail.com
Citation:
Roy AK, Singh M, Kumar P, Kumar BSB (2016) Effect of extended
photoperiod during winter on growth and onset of puberty in
Murrah buffalo heifers, Veterinary World, 9(2): 216-221.
Abstract
Aim:
To investigate the effect of extended photoperiod on growth
rate, hormonal levels, and puberty in Murrah heifers.
Materials and Methods:
About 14 Murrah buffalo heifers were divided into normal day
photoperiod (NDP; n=7) and extended NDP (ENDP; n=7) groups. The
ENDP group was exposed to 4 h of extended photoperiod with
artificial light (160 lux) after sunset for 3 months during
winter.
Results:
Group, age and group-by-age interaction effects on plasma
glucose concentrations were non-significant (p>0.05). A
significant effect of age on non-esterified fatty acids
(p<0.05), cholesterol (p<0.01), and triglycerides (p<0.05)
concentrations was observed. Group and group-by-age interaction
effects on plasma T3, T4, leptin, 17 β estradiol, prolactin and
melatonin concentrations were non-significant (p>0.05) while
significant (p<0.05) age effect on T4, leptin and melatonin
concentrations was observed. With respect to the circadian
pattern of melatonin and prolactin, the group, time and groupby-time
interaction effects were non-significant (p>0.05). Average daily
gain and dry matter intake of heifers were nonsignificant
between the NDP and ENDP groups but were comparatively higher in
ENDP group. By the end of the experiment, 6 out of 7 heifers
attained puberty in ENDP group in comparison to 4 out of 7 in
NDP group.
Conclusion:
Extending the photoperiod by artificial light for 4 h during
winter season resulted in better growth rate and early onset of
puberty in Murrah buffalo heifers.
Keywords:
buffalo, leptin, melatonin, metabolites, photoperiod, prolactin,
puberty.
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