Molecular Nutrition

Effects of Probiotics on Growth Performance and Intestinal Health of Stressed Male Broilers

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  • 1. College of Animal Science and Technology, Shandong Agricultural University, Tai'an 271018, China;
    2. Shandong Fengxiang Group Limited Liability Company, Yanggu 252300, China;
    3. Jiangsu Hengfengqiang Biotechnology Co., Ltd., Nantong 226000, China

Received date: 2017-04-20

  Online published: 2017-10-31

Abstract

The experiment was conducted to investigate the effects of stress on growth performance and intestinal health of male broilers and the possible relieve roles of probiotics. In this experiment, the stress was mimicked with dexamethasone (DEX) injection. One hundred and seventy-six 1-day-old Arbor Acres (AA) male broilers were selected and allocated into four groups with four replicates each and 11 broilers in each replicate according to 2×2 factorial design, which consisted of stress and probiotics group (injection of 2 mg/kg BW DEX and drinking 0.02 g probiotics per day per bird), stress group (injection of 2 mg/kg BW DEX), probiotics group (drinking 0.02 g probiotics per day per bird), blank group (injection of 2 mg/kg BW saline). Probiotics dissolved with cooling boiled water were supplemented into drinking water for broilers in 11 to 14 days and 25 to 28 days of age in probiotics group and stress and probiotics group, while cooling boiled water without probiotics for stress group and blank group. And broilers in 12 to 14 days and 26 to 28 days of age were subcutaneously injected with dexamethasone sodium phosphate in stress group and stress and probiotics group, while the same dose of saline for probiotics group and blank group. The experiment lasted for 35 days. The results showed that stress significantly reduced average daily gain and European performance index (EPI) of 35-day-old mail broilers (P<0.05), while significantly increased the ratio of feed to gain and mortality rate (P<0.05); and the immunity organ indices and the jejunum villus height of broilers were significantly decreased under stress (P<0.05). Probiotics significantly improved the activity of pancreatic lipase and jejunum villus height (P<0.05), but significantly reduced jejunum crypt depth (P<0.05). There was a significant interaction between stress and probiotics on the ratio of villus height to crypt depth (P<0.05). In conclusion, stress damages the microenvironment in the intestine of mail broilers, reduces the growth performance and inhibits the normal development of immunity organs. Probiotics can significantly alleviate the negative effects of stress on intestinal villus damage. However, no significant effects of probiotics on growth performance were found.

Cite this article

ZHONG Guang, WANG Jinsheng, WANG Yanhui, ZHANG Shuai, QU Kunpeng, ZHOU Huajin, GAO Huaitao, SONG Zhigang . Effects of Probiotics on Growth Performance and Intestinal Health of Stressed Male Broilers[J]. Chinese Journal of Animal Nutrition, 2017 , 29(11) : 4123 -4130 . DOI: 10.3969/j.issn.1006-267x.2017.11.035

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