Document Detail


Phosphorus requirements for 60- to 100-kg pigs selected for high lean deposition under different thermal environments.
MedLine Citation:
PMID:  22573837     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Two experiments were conducted to determine the requirement of available P (aP) of pigs selected for high lean deposition during summer (maximum and minimum temperatures of 29.8 ± 3.6 and 21.3 ± 1.1°C, respectively; Exp. 1) and winter (maximum and minimum temperatures of 24.7 ± 2.1 and 9.1 ± 1.6°C, respectively; Exp. 2). Pigs (66.5 ± 2.8 kg, Exp. 1; and 61.1 ± 0.6 kg, Exp. 2) were randomly allotted to 5 dietary treatments. Exp. 1 had 5 pens/treatment and Exp. 2 had 6 pens/treatment, and all pens had 2 pigs. Treatments were composed of a corn-soybean meal basal diet and 4 diets with additional dicalcium phosphate to obtain 5 aP concentrations (0.122, 0.187, 0.252, 0.317, and 0.382% in Exp. 1, and 0.135, 0.200, 0.265, 0.330, and 0.395% in Exp. 2). Pigs were allowed ad libitum access to their respective diets for 30 d. In Exp. 1, increasing aP improved ADFI and ADG (quadratic, P < 0.05), with maximum responses obtained at 0.226 and 0.256% of aP, respectively. Increasing aP improved (P < 0.05) G:F. A broken-line analysis indicated that G:F was maximized (P < 0.05) at 0.295% of aP or 9.04 g of aP/d. Increasing aP also increased (quadratic, P < 0.05) P and Ca (g/kg) in the metacarpals with maximum responses obtained at 0.314 and 0.272% of aP, respectively. The percentage of ash in the metacarpals continued to increase (linear, P < 0.05) with increasing aP. In Exp. 2, ADG and G:F improved (linear and quadratic, P < 0.05) as aP increased in the diet. A broken-line analysis indicated that G:F was maximized (P < 0.05) at 0.316% of aP or 10.58 g of aP per day. However, increasing aP had no effect on ADFI. Percentages of ash, P, and Ca in the metacarpals increased (linear, P < 0.05) with increasing aP. In conclusion, results of this experiment indicated that finishing pigs (60 to 100 kg) kept in a thermoneutral environment require 0.316% aP in the diet (10.58 g/d) to maximize G:F, but the requirement is only 0.295% aP (9.04 g/d) when pigs are under heat stress.
Authors:
A Saraiva; J L Donzele; R F M Oliveira; M L T Abreu; F C O Silva; S E F Guimarães; S W Kim
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Publication Detail:
Type:  Journal Article; Randomized Controlled Trial    
Journal Detail:
Title:  Journal of animal science     Volume:  90     ISSN:  1525-3163     ISO Abbreviation:  J. Anim. Sci.     Publication Date:  2012 May 
Date Detail:
Created Date:  2012-05-10     Completed Date:  2012-09-27     Revised Date:  2012-10-05    
Medline Journal Info:
Nlm Unique ID:  8003002     Medline TA:  J Anim Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1499-505     Citation Subset:  IM    
Affiliation:
Universidade Federal de Viçosa, Viçosa, Minas Gerais, 36570, Brazil.
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MeSH Terms
Descriptor/Qualifier:
Animal Feed
Animal Nutritional Physiological Phenomena
Animals
Body Weight
Diet / veterinary
Dietary Supplements
Muscle, Skeletal / physiology*
Nutritional Requirements
Phosphorus, Dietary / administration & dosage*,  metabolism
Selection, Genetic*
Swine / genetics*,  physiology*
Temperature*
Chemical
Reg. No./Substance:
0/Phosphorus, Dietary
Comments/Corrections
Erratum In:
J Anim Sci. 2012 Jul;90(7):2424

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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