Effect of fat sources on ATTD of minerals

Abstract Text: An experiment was conducted to determine the effect of supplementing diets fed to growing pigs with fat sources that differ in their concentrations of fatty acids on the apparent total tract digestibility (ATTD) of Ca, P, Mg, Zn, Mn, Na, and K. A basal diet based on corn and potato protein isolate was formulated that contained 7% sucrose. Five additional diets that were similar to the previous diet except that sucrose was replaced by 7% tallow, choice white grease (CWG), palm oil (PO), corn oil (CO), or soybean oil (SBO) were formulated. Diets were formulated to contain 0.70% Ca and 0.33% standardized total tract digestible P. Sixty growing barrows (initial BW = 15.99 ± 1.48 kg) were allotted to a randomized complete block design with 6 dietary treatments and 10 replicate pigs per treatment. Experimental diets were provided for 12 d with the initial 5 d being the adaptation period. Total feces were collected for 5 d using the marker-to-marker approach. The ATTD of Ca was greater (P < 0.05) for pigs fed diets containing SBO, CO, PO, or tallow than for pigs fed the basal diet or the CWG-diet, but pigs fed the diet containing tallow were not different from pigs fed a diet containing CWG (Table 1). ATTD of P was greater (P < 0.05) for diets containing SO or tallow compared with the basal diet or the CWG diet. The ATTD of Mg, Zn, Mn, Na, and K were not different among treatments. In conclusion, supplementation of CWG to diets fed to pigs does not change the digestibility of minerals, but tallow, PO, CO, and SBO may increase the digestibility of Ca and P, but not of other minerals.  

 Table 1. Apparent total tract digestibility (ATTD) of minerals in diets containing different fat sources

		Ingredient
Item	Basal	Tallow	Choice white grease	Palm oil	Corn oil	Soybean oil	P Value
Ca	50.69c	65.13ab	54.07bc	66.07a	71.20a	71.24a	0.001
P	52.06c	62.00ab	53.52bc	61.06ab	59.24abc	62.98a	0.001
Mg	25.62	24.73	23.53	26.94	30.91	35.37	0.163
Zn	13.51	15.87	11.74	13.68	17.00	14.40	0.958
Mn	14.70	21.62	15.98	21.43	22.49	20.54	0.417
K	76.68	74.26	72.60	77.37	73.89	79.17	0.114
Na	90.40	90.99	90.66	90.69	91.30	91.95	0.363
S	81.70ab	83.75ab	81.31b	83.98ab	84.03ab	84.40a	0.011

Keywords: minerals, fat, pigs