Abstract
Fifty non-pregnant Surti buffalo heifers aged between 17 and 42 months (n=24, <24 months;n=26, >24 months) were randomly assigned to groups subject to either natural daylight +4h supplemental light (n=25) or natural day light (n=25), to study changes in growth, serum prolactin (Prl), progesterone (P4) and luteinizing hormone (LH) to supplemental lighting. Ambient temperatures (T) and relative humidity (RH) generally were >27° C and <70% during the day-time, respectively. Light-supplemented heifers had 16.2 kg net body weight (BW) gain at 9 weeks compared to 20.8 kg for controls, but higher mean Prl after 6.5 weeks (P<0.01), and higher P4 (0.41 vs 0.19 ng/ml;P<0.06) than control heifers. Older heifers had 39.7% greater BW (P<0.01), but a net 4.3% BW gain compared to a 10.1% gain for younger heifers at 10 weeks. Older, light-supplemented heifers had higher mean P4 (0.63 vs 0.19 ng/ml;P<0.07) than the other groups. These weight and hormonal changes suggest that 4 h supplemental light can alter growth and endocrine function in buffaloes under similar planes of nutrition. While light supplementation did not have a positive effect on body wieght during the 10 week study, body weight and endocrine changes due to supplemental light may be important factors for initiation of reproductive cyclicity.
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Perera, K.S., Gwazdauskas, F.C., Akers, R.M. et al. Effect of supplemental light on growth, prolactin, progesterone and luteinizing hormone in water buffalo (Bubalus bubalis). Int J Biometeorol 33, 89–94 (1989). https://doi.org/10.1007/BF01686284
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DOI: https://doi.org/10.1007/BF01686284