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Effect of protein and protein-free energy intake on protein and fat deposition rates in preruminant calves of 80 to 240 kg live weight
- Source :
- Scopus-Elsevier, Journal of Animal Science 74 (1996), Journal of Animal Science, 74, 2129-2139
- Publication Year :
- 1996
-
Abstract
- Two experiments were conducted to quantify the effects of protein intake on protein and fat deposition rates at two protein-free, energy intake levels in 90 preruminant Holstein Friesian x Dutch Friesian calves. The two experiments were similar in design, but were performed in two different weight ranges: 80 to 160 kg BW and 160 to 240 kg BW in Exp. 1 and 2, respectively. In each experiment, calves were allocated to either an initial slaughter group or to one of 12 treatments (three calves per treatment), which consisted of six protein intake levels at each of two protein-free energy intake levels. Calves were slaughtered and analyzed for body composition when they had reached the target weight. A balance study was conducted when calves reached 120 and 200 kg BW in Exp. 1 and 2, respectively. Protein digestibility increased with increasing protein intake in both experiments (P < .001). Average daily gain of the empty body varied between 640 and 1,340 g/d and between 420 and 1,370 g/d in Exp. 1 and 2, respectively, and was affected by protein (P < .001) and protein-free energy intake (P < .001). The calves responded to increased protein intake by increasing their protein (P < .001) and fat (P < .01) deposition rates. Maximum protein deposition was reached in the second experiment at 244 g/d. Extra protein-free energy intake resulted mainly in extra fat deposition (P < .001), but also increased the protein deposition (P < .01), even at low protein intake levels. In both experiments, the response of protein deposition rate to increased protein intakes was low: about 30% of the extra ingested protein was deposited. These results clearly demonstrate a low priority for partitioning dietary protein into protein gain in these calves.
- Subjects :
- Male
Aging
Low protein
Animal Nutrition
Live weight
Protein Retention
Growth
Biology
Weight Gain
Random Allocation
Animal science
Protein digestibility
Genetics
Veehouderij
Animals
Animal Husbandry
Target weight
Nutrition
Balance study
Veal Calves
Body Weight
Proteins
General Medicine
Lipid Metabolism
Diervoeding
Protein free
Digestibility
WIAS
Body Composition
Animal Science and Zoology
Composition (visual arts)
Protein Intake
Cattle
Digestion
Dietary Proteins
Energy Intake
Energy Metabolism
Deposition (chemistry)
Food Science
Subjects
Details
- ISSN :
- 00218812
- Volume :
- 74
- Issue :
- 9
- Database :
- OpenAIRE
- Journal :
- Journal of animal science
- Accession number :
- edsair.doi.dedup.....8e87ea22d25444f6311891bdc52b4103