Efficiencies of Energy Utilization during Growth

Webster, A. J. F.

doi:10.1007/978-1-4615-8903-7_7

Cited by 8 publications

(2 citation statements)

References 14 publications

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“…The Table.4 also gives the average energy content of the carcasses in the two lines. Based on the assumption that wet muscle has an energy content of 4.7 kJ/g and that there is 39.2 kJ/g fat in the carcass ' (Webster 1976), there is a difference in energy content of 64.5 MJ or 15.4 Mcal between the two lines with significantly higher value in the LP-line. This was based on the assumption of the same meat/fat ratio of head, feet, intestines and flare fat.…”

Section: Resultsmentioning

confidence: 99%

Studies on a Two Trait Selection Experiment in Pigs

Vangen

1980

Acta Agriculturae Scandinavica

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Section: Resultsmentioning

confidence: 99%

Studies on a Two Trait Selection Experiment in Pigs

Vangen

1980

Acta Agriculturae Scandinavica

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“…The difference in the composition of gain may possibly indicate the Menz's superiority in efficiency of feed utilization for fat deposition. It has been reported that energetic efficiency is higher in genetically fat animals and that such animals tend to use higher proportion of metabolizable energy consumed for fat deposition compared to leaner genotypes ( hood and allen 1973; webster 1976). Thus, the higher fat deposition by the Menz compared to the Horro kept under similar feeding regime may possibly be due to higher energetic efficiency of the Menz, which in turn may be due to the Menz's intrinsic genetic tendency to fatness.…”

Section: Breed Differencesmentioning

confidence: 99%

Fat deposition in tropical sheep as adaptive attribute to periodic feed fluctuation

Ermias

Yami

Rege³

2002

J Animal Breeding Genetics

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Summary Ruminants adapt to periodic fluctuation in feed resources by accumulating fat stores during favourable periods. Thus, genetic variations, among ruminant genotypes, in the capacity to deposit fat could be exploited through breeding to improve animal productivity in traditional tropical production systems. Based on this premise, breed differences among weights of principal adipose depots and total body fat were estimated in Menz (n = 303) and Horro (n = 151) sheep of Ethiopia. Animals were kept on supplemental feeding, for about 3.5 months, until slaughter at about 17 months of age and pre‐slaughter live weight of 25 kg. Except the combined weight of tail and rump fat (TRF) which was similar (p > 0.05) in the two breeds, weights of subcutaneous and intermuscular fat (SIF), internal fat (IF) as well as total dissected body fat (TotDF), total ether‐extracted body fat (TotEE) and TotFAT (TotDF plus ‘residual’ fat, fat recovered by ether‐extraction from non‐adipose tissues) were significantly (p < 0.01) higher in the Menz. TotDF, TotEE and TotFAT were 1.91 ± 0.04, 2.05 ± 0.06 and 2.64 ± 0.06 kg, respectively, in the Menz and 1.50 ± 0.05, 1.44 ± 0.06 and 2.02 ± 0.07 kg, respectively, in the Horro. Implications of breed differences in fat distribution among depots, and possible consequences of genetic improvement of some of the depots on adaptation to climatic and nutritional stresses as well as some production objectives are discussed.

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Feed intake in six lines of pigs and its influence on growth and carcass traits 1. Feeding twice daily for 20 min per session

Cöp¹,

Buiting²

1977

Anim. Sci.

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For a crossbreeding experiment six lines of pigs were developed from six breeds: Belgian Landrace (B), Pietrain (P), Dutch Landrace (N), Dutch Yorkshire (G), Duroc (D) and Hampshire (H). Out of 10 different litters per line, one female and one castrate male were housed and fed individually from 20 to 96 kg. All pigs were offered feed twice daily for 20 min exactly. Maximum differences in feed intake between the lines increased from 150 g at 25 kg to more than 500 g at 95 kg live weight. Daily intake of Pietrain pigs was lower than that of all other lines. Differences between the N, H and G lines were small. The difference between the feed intake of males and females increased from zero at 27 kg to 230 g at 75 kg. Differences in daily gain were greatest between the P and G lines, and doubled during the growing period from 80 g to 170 g. Differences in daily gain between the N, H and B lines were small. Pietrain pigs and, to a lesser extent, Belgian Landrace pigs produced more meaty carcasses but both had poorer meat quality than other other lines. It is concluded that differences in feed intake might be the main causal factor for the existence of differences between biological types of pigs.

show abstract

Efficiencies of Energy Utilization during Growth

Cited by 8 publications

References 14 publications

Studies on a Two Trait Selection Experiment in Pigs

Studies on a Two Trait Selection Experiment in Pigs

Fat deposition in tropical sheep as adaptive attribute to periodic feed fluctuation

Feed intake in six lines of pigs and its influence on growth and carcass traits 1. Feeding twice daily for 20 min per session

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