Scientia Agricultura Sinica ›› 2016, Vol. 49 ›› Issue (7): 1382-1390.doi: 10.3864/j.issn.0578-1752.2016.07.014

• ANIMAL SCIENCE·VETERINARY SCIENCERE·SOURCE INSECT • Previous Articles     Next Articles

Comparative Analysis of Growth Performance, Behavior, and Salivary Cortisol Hormone of Piglets Housed in Two Rearing Environments

ZHU Hong-long1, YANG Jie1, LI Jian1, PAN Xiao-qing1, QIN Feng1ZHOU Zhong-kai2, FENG Guo-xing1, GU Hong-ru1   

  1. 1Institute of Livestock Science, Jiangsu Academy of Agricultural Sciences, Nanjing 210014
    2Institute of Facilities and Equipment in Agriculture, Jiangsu Academy of Agricultural Sciences, Nanjing 210014
  • Received:2015-06-23 Online:2016-04-01 Published:2016-04-01

Abstract: 【Objective】The aim of this study is to make a comparative analysis of growth performance, behavior, and cortisol hormone of weaned piglets housed in two rearing environments.【Method】A total of 88 Suzhong piglets (half of castrated male and female) weaned at 35 d of age were randomly assigned into either the slatted-floor house (SFH) treatment or the deep-litter house (DLH) treatment. Each treatment had 4 pens (4 replicates), and according to the similar rearing density (0.67 m2/animal), each replicate for SFH and DLH had 6 and 16 piglets respectively. The experiment included 14 days of an adaption period and 21 days of an experimental period. Piglets had always access to feed and water. Feed intake was recorded during the experiment period, and piglets were weighed individually at the age of 49 and 70 days to get the growth performance according to replicate. At the age of 68 days, video was recorded for 24 h, and the three piglets from each replicate were selected for observation of piglets’ behavior during daylight from 07:00 to 17:00. Salivary samples of the three piglets from each replicate were collected from 09:00 to 10:00 for the cortisol analysis at the age of 69 days.【Result】Final weight, average daily feed intake, average daily gain, and feed/gain ratio of piglets from DLH did not differ from those of piglets from SFH (P>0.05). Piglets from DLH spent significantly more time in standing and sitting (P<0.05), and less time lying (P<0.05) compared to piglets from SFH. The activities of piglets mainly occurred during 08:00-10:00 and 12:00-16:00. DLH piglets spent more time at locomotion and explorative behavior (particularly rooting deep bedding) (P<0.05), and less time manipulating pen and aggressive behavior (P<0.05), compared to SFH piglets. DLH increased the time spent drinking (P<0.05), but had no effect on the time spent eliminating (P>0.05). DLH decreased the total time spent feeding (P<0.05), but DLH piglets exhibited higher average duration of feeding events due to their low number of feeding events. DLH increased the concentration of cortisol in saliva of weaned piglets (P<0.05).【Conclusion】DLH could increase time spent in locomotion, explorative behavior, and average duration of feeding events and decrease time spent in aggressive behavior in weaned piglets. These data showed DLH could improve animal welfare in the piglet production.

Key words: rearing environments, weaned piglets, behavior, cortisol hormone

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