Linked Life Data

21097683

Source:http://linkedlifedata.com/resource/pubmed/id/21097683

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pubmed-article:21097683pubmed:issue3lld:pubmed
pubmed-article:21097683pubmed:dateCreated2011-2-24lld:pubmed
pubmed-article:21097683pubmed:abstractTextFifty-eight purebred castrated male Iberian (IB) piglets (initial BW 9.9 ± 0.1 kg) were used in an experiment to determine the effect of dietary protein content (PC) and feeding level (FL) on the rates of BW gain, whole body protein deposition (PD), and energy utilization between 10 and 25 kg of BW using the serial slaughter method. Treatments followed a 4 × 2 factorial arrangement with 4 PC (201, 176, 149, and 123 g of CP/kg of DM) and 2 FL (0.95 and 0.70 × ad libitum) and 6 or 7 piglets per combination of treatments. All diets were formulated to have an optimal AA pattern. Six piglets were slaughtered at the start of the trial to estimate initial body composition. The experimental pigs were individually housed in an environmentally controlled room (27 ± 2°C) until they reached 25 kg of BW, when they were slaughtered and analyzed for body composition. Positive linear effects of dietary PC on ADG, G:F, and gain:ME intake were observed (P < 0.001). Piglets fed at the highest FL showed greater ADG, G:F, and gain:ME intake (P < 0.001). An average increase was estimated to be 38.0 g of gain/MJ of ME intake. Protein deposition increased linearly from 35.6 to 50.9 g/d with increasing dietary PC (P < 0.001). A daily increase was estimated to be 0.35 g of PD/g of CP intake. Although the maximal genetic potential for PD of the IB piglet was not attained, a maximal value of 59.9 g/d for whole-body PD was achieved when the diet provided 201 g of CP/kg of DM and was fed at 0.95 × ad libitum. Piglets on the highest FL deposited on average 39% more body protein (P < 0.001) than restricted piglets. An average value of 4.39 g increase in PD/MJ of ME intake was obtained for diets containing 201 and 176 g of CP/kg of DM. Maintenance energy requirements and net efficiency of utilization of ME for growth, calculated by linear regression of ME intake on body retained energy, were 427 kJ/kg of BW(0.75)·d(-1) and 0.552, respectively. The corresponding partial efficiencies of utilization of ME for protein and fat deposition were 0.378 and 0.672, respectively, considerably less than the accepted values for conventional pig breeds. Practical diets of the young IB piglet should contain at least 201 g of ideal CP/kg of DM.lld:pubmed
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pubmed-article:21097683pubmed:authorpubmed-author:NietoRRlld:pubmed
pubmed-article:21097683pubmed:authorpubmed-author:AguinagaM AMAlld:pubmed
pubmed-article:21097683pubmed:authorpubmed-author:AguileraJ FJFlld:pubmed
pubmed-article:21097683pubmed:authorpubmed-author:Conde-Aguiler...lld:pubmed
pubmed-article:21097683pubmed:issnTypeElectroniclld:pubmed
pubmed-article:21097683pubmed:volume89lld:pubmed
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pubmed-article:21097683pubmed:pagination754-63lld:pubmed
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pubmed-article:21097683pubmed:year2011lld:pubmed
pubmed-article:21097683pubmed:articleTitleNutrient and energy retention in weaned Iberian piglets fed diets with different protein concentrations.lld:pubmed
pubmed-article:21097683pubmed:affiliationDepartment of Physiology and Biochemistry of Animal Nutrition, Animal Nutrition Institute (IFNA), Estación Experimental del Zaidín (CSIC), Camino del jueves s/n, 18100 Armilla, Granada, Spain.lld:pubmed
pubmed-article:21097683pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:21097683pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed