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Title: Efficiency of energy and protein deposition in swine during compensatory growth measured by dual energy X-ray absorptiometry (DXA)

Author
item Mitchell, Alva
item SCHOLZ, A - UNIVERSITY OF MUNICH

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 1/21/2007
Publication Date: 9/15/2007
Citation: Mitchell, A.D., Scholz, A.M. 2007. Efficiency of energy and protein deposition in swine during compensatory growth measured by dual energy x-ray absorptiometry (DXA) [abstract]. 2nd International Symposium on Energy and Protein Metabolism and Nutrition.

Interpretive Summary:

Technical Abstract: A study was conducted to examine the effects of controlled intake, dietary protein (CP) level, and ractopamine supplementation on growth, body composition, and the efficiency of energy and protein deposition in pigs during uninterrupted or compensatory growth from 60 to 100 kg. Seven groups of pigs (58 pigs in total) were scanned by DXA for body composition analysis at a starting weight of 61.4 kg and at a final weight of 100.9 kg. Three groups of pigs were fed at continuous intake levels from 60 kg: ad libitum (A) the basal diet (186 g per kg CP and 13.58 MJ per kg ME), ad libitum plus 20 mg per kg ractopamine (R), and limited at calculated NRC energy intake level (C). Four groups of pigs were maintained at 60 kg for 56 d, scanned by DXA again, and then fed: 200 g per kg CP (13.73 MJ per kg ME) diet at C intake (M-HP), 120 g per kg CP (13.79 MJ per kg ME) diet at C intake (M-LP), ad libitum intake (M-A), and ad libitum intake plus R (M-R). There was no difference in the growth rate (0.95 kg per day) during the final phase for pigs were fed at the calculated energy intake level (C). Feeding R resulted in a 13% increase in the rate of weight gain compared to A (1.15 vs. 1.02 kg per day), consisting of a 29% increase in the rate of lean tissue deposition (0.86 vs. 0.67 kg per day) and an 18% reduction in the rate of fat deposition (0.27 vs. 0.33 kg per day). Total body fat and protein deposition were based on the differences between the 60-kg and 100-kg DXA measurements of fat and lean. Energy deposition was calculated as the sum of fat deposition (39.6 MJ per kg) and protein deposition (23.7 MJ per kg). The efficiency of energy (kg) and protein (PE) deposition was affected by diet and compensatory growth.