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The effect of microbial phytase supplementation of sorghum-canola meal diets with no added inorganic phosphorus on growth performance, apparent total-tract phosphorus, calcium, nitrogen and energy utilization, bone measurements, and serum variables of growing and finishing swine
- Source :
-
Livestock Science . Aug2018, Vol. 214, p180-188. 9p. - Publication Year :
- 2018
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Abstract
- Two experiments were conducted with growing and finishing swine to determine the effect of phytase supplementation of sorghum-canola meal diets without added inorganic phosphorus ( iP ) on growth performance, apparent total-tract P, calcium ( Ca ), nitrogen ( N ), and energy utilization, bone strength, bone ash, serum Ca and P concentrations, and serum phosphatase activity. For Exp. 1, 42 crossbred barrows in individual metabolism cages were fed a P-deficient diet for 7 d before starting a 28-d experiment at 24.8 kg body weight ( BW ). Experiment 1 had 7 treatments that were a negative control ( NC ) diet supplemented with 0, 400, 800, 1200, or 1600 U of Aspergillus niger ( AN ) phytase / kg, a positive control ( PC ) diet, and the PC diet supplemented with 1200 U of AN phytase / kg. Fecal and urine collections were made from d 21–26. Blood samples were collected on d 0, 14, and 28. For Exp. 2, 126 growing-finishing crossbred swine with an initial BW of 21.6 kg were group-fed (3 pigs/pen) in 3 phases (grower, early-finisher, and late-finisher). Experiment 2 had 6 treatments that were a NC diet for each phase supplemented with 0, 200, 400, 600, or 800 U of AN phytase / kg and a PC diet. Fecal collections were made from d 49–54. Blood samples were collected on d 35, 63, and 91. For both experiments, 400 U of AN phytase / kg of diet was adequate ( P ≤ 0.05) for growth performance compared with the PC treatment groups. For Exp. 1, apparent total-tract P absorption and retention plateaued at 1200 U of AN phytase / kg of diet ( P < 0.01), with fecal Ca and P excretion reduced 22.4% and 28.6%, respectively, compared with the PC treatment group. However, pigs fed the PC + 1200 U of AN phytase / kg absorbed and retained more P (g / d, P < 0.01) than any other treatment group. For Exp. 2, apparent total-tract P absorption, bone strength, and bone ash weight plateaued at 600 U of AN phytase / kg of diet ( P < 0.01), with fecal P excretion reduced 29.4% compared with the PC treatment group. For both experiments, the AN phytase treatments did not increase Ca, N, or energy absorption (amount / d or % of intake), and had no effect on serum Ca and P concentrations, or the serum activity of alkaline phosphatase, total acid phosphatase, or tartrate-resistant acid phosphatase. [ABSTRACT FROM AUTHOR]
- Subjects :
- *SERUM
*SORGHUM
*PHOSPHORUS
*PHYTASES
*BODY weight
Subjects
Details
- Language :
- English
- ISSN :
- 18711413
- Volume :
- 214
- Database :
- Academic Search Index
- Journal :
- Livestock Science
- Publication Type :
- Academic Journal
- Accession number :
- 130876718
- Full Text :
- https://doi.org/10.1016/j.livsci.2018.05.017