222 Effects of increasing chloride from potassium chloride on 7 to 12 kg nursery pig growth performance. (10th April 2018)

• Record Type: Journal Article
• Authors: Shawk, D J; Nemechek, K N; Goodband, B D; Woodworth, J C; Tokach, M D; Dritz, S S; Chitakasempornkul, K; Bello, N M; DeRouchey, J M
• Is Part Of: Journal of animal science. Volume 96(2018)Supplement 2
• Page Start: 118
• Page End: 118
• Publication Date: 2018-04-10
• Subjects: salt -- chloride -- nursery pig; Livestock -- Periodicals; Livestock; Electronic journals; Periodicals; 636.005
• DOI: 10.1093/jas/sky073.219
• Languages: English
• ISSNs: 0021-8812

Abstract

Abstract: A total of 300 nursery pigs (DNA Line 241 × 600, initially 7 kg) were used in a 14-d trial to determine effects of increasing dietary Cl concentrations on nursery pig growth performance. Pigs were weaned at 21 d of age. Upon entry to the nursery, pigs were grouped in pens of 5 consisting of either a 2:3 or a 3:2 ratio of barrows:gilts, and fed a common starter diet (0.33% Na and 0.76% Cl) for 7 d. On d 7 after weaning, considered d 0 in the trial, pens were blocked by BW within each sex ratio and randomly assigned to treatments, with 10 pens/treatment. Experimental treatments consisted of a control diet containing 0.33% Na and 0.55% Cl provided by 0.78% added salt and 5 diets with 0.33% Na and added potassium chloride to provide 0.09, 0.21, 0.32, 0.45, or 0.55% Cl. Dietary K was not held constant across dietary treatments. Growth performance (ADG, ADFI, G:F) was recorded at the pen level and analyzed using linear mixed models that accommodated the split-plot nature of the experimental design and recognized pen as the experimental unit for treatment. Linear and quadratic orthogonal polynomials were evaluated. Additionally, the 0.78% added salt control and 0.55% Cl treatment were compared. From d 0 to 14, ADG, ADFI, and G:F improved (quadratic, P < 0.05) as dietary Cl concentration increased from 0.09 to 0.32% with no further benefit observed thereafter. Pigs fed the control diet (0.33% Na and 0.55% Cl from added salt) showed no evidence for a difference in ADG, lower ( P < 0.05) ADFI and marginally increased ( P = 0.069) G:F than those fed 0.55% Cl from KCl. In conclusion, the greatest growth performance was achieved with a dietary Cl concentration of 0.32% in pigs from 7 to 12 kg.