Effects of Different Light Conditions on Growth Performance, Onset of Puberty and Serum Hormone Indexes of Replacement Gilts

PENG Jiyong; WANG Kun; ZHUO Yong; LI Jian; LIN Yan; XU Shengyu; CHE Lianqiang; FENG Bin; WU De; FANG Zhengfeng

doi:10.3969/j.issn.1006-267x.2021.08.055

2021 , Vol. 33 >Issue 8: 4769 - 4778

DOI: https://doi.org/10.3969/j.issn.1006-267x.2021.08.055

SHORT COMMUNICATION

Effects of Different Light Conditions on Growth Performance, Onset of Puberty and Serum Hormone Indexes of Replacement Gilts

PENG Jiyong ,
WANG Kun ,
ZHUO Yong ,
LI Jian ,
LIN Yan ,
XU Shengyu ,
CHE Lianqiang ,
FENG Bin ,
WU De ,
FANG Zhengfeng

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Key Laboratory for Animal Disease-Resistance Nutrition of Ministry of Education, Animal Nutrition Institute, Sichuan Agricultural University, Chengdu 611130, China

Received date: 2021-01-29

Online published: 2021-08-11

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Abstract

This study was conducted to investigate the effects of different light conditions (light cycle and light intensity) on growth performance, onset of puberty and serum hormone indexes of replacement gilts. A total of 72 two-way cross replacement gilts with good body condition, similar consanguinity, (140±3) days of age and body weight of (66±7) kg were randomly allocated into 3 groups with 12 replicates per group and 2 pigs per replicate. Experimental group Ⅰ:10 h illumination and 14 h darkness (10L:14D), and the light intensity was 100 lx; experimental group Ⅱ:16 h illumination and 8 h darkness (16L:8D), and the light intensity was 100 lx; experimental group Ⅲ:16 h illumination and 8 h darkness (16L:8D), and the light intensity was 50 lx. The pre-experiment lasted for 10 days and the experiment lasted for 78 days. The results showed as follows:1) during 171 to 200 days of age, under 100 lx light intensity, 16L:8D light cycle had a tendency to reduce the feed to gain ratio of replacement gilts compared with 10L:14D light cycle (P=0.068). Light intensity had no significant effect on growth performance of replacement gilts (P>0.05). 2) Under 16L:8D light cycle, 50 lx light intensity had a tendency to reduce the weight of puberty of replacement gilts compared with 100 lx light intensity (P=0.086). The weight of puberty and age of puberty of replacement gilts in experimental group Ⅲ were the lowest, and the estrus rate was the highest. 3) On 170 days of age, under 100 lx light intensity, 16L:8D light cycle significantly increased the serum follicle stimulating hormone (FSH) concentration of replacement gilts compared with 10L:14D light cycle (P<0.01), 10L:14D light cycle significantly increased the serum insulin like growth factor-Ⅰ (IGF-Ⅰ) concentration of replacement gilts compared with 16L:8D light cycle (P<0.05). Under 16L:8D light cycle, 100 lx light intensity significantly increased the concentrations of FSH and luteinizing hormone (LH) in serum of replacement gilts compared with 50 lx light intensity (P<0.05). 4) On 170 days of age, under 16L:8D light cycle, 100 lx light intensity significantly increased the serum LH concentration of replacement gilts compared with 50 lx light intensity (P<0.05), significantly increased the serum melatonin concentration (P<0.01), significantly decreased the serum leptin concentration (P<0.01), and had tendencies to increase the serum FSH concentration (P=0.077) and decrease the serum IGF-Ⅰ concentration (P=0.055). In conclusion, extending daily light duration from 10 hours to 16 hours can help to improve feed conversion rate of gilts, promote the secretion of hormone related to estrus initiation, whereas light intensity showed little effect on growth performance and puberty performance of replacement gilts. It is preferential to recommend 50 lx light intensity in production.

Key words： light cycle; lighting intensity; replacement gilts; growth performance; onset of puberty; hormone

Cite this article

PENG Jiyong , WANG Kun , ZHUO Yong , LI Jian , LIN Yan , XU Shengyu , CHE Lianqiang , FENG Bin , WU De , FANG Zhengfeng . Effects of Different Light Conditions on Growth Performance, Onset of Puberty and Serum Hormone Indexes of Replacement Gilts[J]. Chinese Journal of Animal Nutrition, 2021 , 33(8) : 4769 -4778 . DOI: 10.3969/j.issn.1006-267x.2021.08.055

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