DIGESTIBLE CALCIUM AND DIGESTIBLE PHOSPHORUS IN SWINE DIETS

DIGESTIBLE CALCIUM AND DIGESTIBLE PHOSPHORUS IN SWINE DIETS S. A. Lee, L. V. Lagos, and H. H. Stein Department of Animal Sciences, Division of Nutritional Sciences University of Illinois DISCUSSANTS: Cathlyn G. Castro & Alby Marie R. Patricio.

PART I Introduction Digestibility of Calcium Digestibility Values for Calcium in Feed Ingredients Digestibility Values for Calcium by Gestation Sows.

Phosphorus Relative Bioavailability Standardized total tract digestibilility (STTD) Calcium Digestible Calcium Total Calcium.

Apparent total tract digestibility (ATTD) Standardized total tract digestibility (STTD) True total tract digestibility (TTTD).

Apparent total tract digestibility (ATTD). ATTD = intake – output X 100 Intake.

Basal endogenous loss. Basal endogenous loss = output of Ca X 1,000 DMI.

Standardized total tract digestibility (STTD). STTD = intake – (output- daily basal endogenous loss) X 100 intake.

True total tract digestibility ( T TTD). TTTD = intake – (output- daily total endogenous loss) X 100 intake.

Mineral Supplements Phosphates Calcium Carbonate Plant Feed Ingredient Soybean Meal Canola Meal Animal Feed Ingredient Meat and Bone Meal Poultry Meal.

Phytate. DIGESTIBILITY VALUES FOR CALCIUM IN FEED INGREDIENTS.

DIGESTIBILITY VALUES FOR CALCIUM IN FEED INGREDIENTS.

I. Apparent total tract digestibility (ATTD), standardized total tract digestibility (STTD), and true total digestibility (TTTD) Of Ca in feed ingredients Without and with phytase added to the diet fed to growing pigs hem, X ATTO d C. STD of c. Supplementatbn Of phyta*i•. Mineral supplanertts Cakiun Caklum carbonate without fat øurcec Dk.akjun Uttwth•mnium cak•reuma phosphatet Plant feed hgredknts meal'•a g meal'. u Sugar bet co-producti Sur&wer mear Aninal feed Meat and me•lü Meat Fish meal-u Poultry mealü Poultry by mealü Skim miA Whey powder? Whey permeate' 68 52 73 63 83 53 22 75 62 85 95 97 61 74 76 66 83 63 71 74 84 77 86 78 68 77 77 82 88 97 99 63 77 79 69 86 86 73 76 87 70 76 IPhytase from to phytase units/kg diet. iGonzäkz•Vega et •L (2015b); iZhane and Adeola (2027); 'Blavi et al. (2017): 'Merriman and Stein (2016); 'Merriman et al. (20160); tUnpubEshed data from the Unwersity of Illinois; 'Zharw et al. (2016); and Kim 12017); et al. (2013); flß0hIke et al. (2@5); üMerriman et at. (2016b); UGonzåkz-Vega et al. (201%)..

DIGESTIBILITY VALUES FOR CALCIUM BY GESTATING SOWS.

Gestating sow. Values of ATTD of Ca and P. Growing pigs.

1.58 1.5 a 1.0 ao.5 0.0 Gestating sows P<O.OOI SED = 0.12 0.43 Growing pigs.

ST TD of Ca (%) in Ca carbonate 60 0.05 50 40 30 20 10 42 Early 28 Mid Gestation period 48 Late (Lee et al., 2019a).

Reason for the differences in Ca and P balance. D ifferent requirement for Ca and P by sows in different gestation periods ..

PART II Requirements for Calcium by Growing Pigs Requirements for Total Calcium Requirements for Digestible Calcium Conclusion.