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- Title
Estimation of the net energy requirements for maintenance in growing and finishing pigs.
- Authors
Zhang, G. F.; Liu, D. W.; Wang, F. L.; Li, D. F.
- Abstract
The objective of this experiment was to detennine the net energy requirements for maintenance of growing and finishing pigs using regression models. Thirty-six growing (27.38 ± 2.24 kg) and 36 finishing (70.25 ± 2.61 kg) barrows were used and within each phase. Pigs received a corn-soybean meal diet fed at 6 levels of feed intake, which were calculated as 0,20,40, 60, 80, or 100% of the estimated ad libitum ME intake (2,400 kJ ME/kg BW0-6 d-1) of the pigs. Measurements were conducted on 6 pigs per feeding level and per stage of growth. After a 5-d adjustment period, barrows in the fasted treatment were kept in respiration chambers for 2 d to measure the fasting heat production. Barrows in the other treatments were kept individually in respiration chambers for a 5-d balance trial followed by a 2-d fasting period. Heat production (HP) in the fed state was measured and feces and urine were collected in the balance trial. The total HP increased (P < 0.01) with increasing feeding levels. Fasting HP increased (P < 0.01) as previous feeding level increased and was less (P = 0.012) in finishing pigs than growing pigs if calculated per kilogram BW0.6 per day. When using an exponential regression analysis, ME requirements for maintenance were estimated at 973 and 921 kJ/kg BW0.6 d-1 and NE requirements for maintenance were estimated at 758 and 732 kJ/kg BW0.6 d-1 for growing and finishing pigs, respectively. The efficiencies of using ME for growth and for maintenance were estimated at 66 and 78.7% for growing and finishing pigs, respectively. It is concluded that exponential regression between HP and a wide range of ME intake may be used as a new method to determine the NE requirement for maintenance.
- Subjects
SWINE growth; BIOENERGETICS; SWINE nutrition; HEAT production (Biology); URINALYSIS
- Publication
Journal of Animal Science, 2014, Vol 92, Issue 7, p2987
- ISSN
0021-8812
- Publication type
Article
- DOI
10.2527/jas.2013-7002