1991 Fiscal Year Final Research Report Summary
Studies on the energy balance in growing pigs in special reference to the effects of feeding levels and behaviour on heat production in pigs.
| Project/Area Number |
02660280
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
畜産学(含草地学)
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| Research Institution | Hiroshima University |
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Principal Investigator |
YAMAMOTO Sadaki Hiroshima Univ. Fac. Appl. Bio. Sci., Anim. Sci., Professor, 生物生産学部生物生産学科, 教授 (20034449)
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| Co-Investigator(Kenkyū-buntansha) |
ITO Toshio Hiroshima Univ. Fac. Appl. Bio. Sci., Anim. Sci., Professor, 生物生産学部生物生産学科, 教授 (30034458)
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| Project Period (FY) |
1990 – 1991
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| Keywords | Heat production / Growing pigs / Feeding level / Temperature / Behaviour / Heart rate / Energy balance / Group feeding |
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| Research Abstract |
A significant relationship between heart rate(HR)and heat production(HP)was obtained(r=0.81-0.95^<**->) in three feeding levels(Low, Medium and High)and under a different environmental temperature. The standing ratio per day(%)decreased with an increase in feeding level(r=-0.80^<**>). Two results of the multuple regression analysis of heat production(HP, kJ/kg^<0.75>h) on feeding level(M, divided by maintenace level ME418kJ/kg^<0.75>d), standing min (S, min/h), time lapse after feeding(T, hour)and in the morning(P=0)or in the afternoon(P=1)were as follows.
(for body weight 13-15 kg)HP=11.74+6.52M+0.24S-0.33T+0.99P(R=0.85^<**>, n=288, PE=11.6%)
(for body weight 38-52 kg)HP= 7.71+8.25M+0.21S-0.34T+1.16P(R=0.92^<**>, n=288 PE=10.5%)
The partial coefficient of standing(S)was 0.21-0.24. Using this value, the increase of HP during 1 hour standing was calculated being 12.6-14.4 kJ/kg^<0.75>. The energy cost of standing to daily HP was 2.2-15.8 %. Each HP under the temperature of 31ﾟC, 23ﾟC and 15ﾟC was 518, 576 and 926 kJ/kg^<0.75>day, respectively. Daily HP increased significantly as environmental temperature increased. At each temperature range, the percentage of lying behaviour per day was 89, 83, 73 %, respectively. The lying time decreased with a decrease of environmental temperature. Heat production for a single penned pig was 518 kj/kg^<0.75>d. on the other hand HP for two penned pigs was 497 kJ/kg^<0.75>d at 31ﾟC. At 15ﾟC, HP for a single penned pig was 926 kJ/kg^<0.75>d, and 744 kJ/kg^<0.75>d for two penned pigs. The ratio of lying posture perday was 73 %, 81 % for a single and two penned pigs, respectively.
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