129 Effect of phytase on growth performance and carcass classification in growing-finishing pigs. (30th November 2020)

• Record Type: Journal Article
• Authors: Silva, Caio A; Dias, Cleandro P; Callegari, Marco A; Souza, Kelly L; Passos, Adsos; Silva, Claudia C
• Is Part Of: Journal of animal science. Volume 98(2020)Supplement 3
• Page Start: 51
• Page End: 52
• Publication Date: 2020-11-30
• Subjects: Phytase -- swine -- growing -- finishing; Livestock -- Periodicals; Livestock; Electronic journals; Periodicals; 636.005
• DOI: 10.1093/jas/skaa054.094
• Languages: English
• ISSNs: 0021-8812

Abstract

Abstract: The objective of this experiment was to evaluate the optimal dosage of phytase fed to growing-finishing pigs. One hundred and twenty barrows, 71 d old and initial body weight 25.16 ± 2.80kg, were distributed in 40 pens according to a randomized complete block design and assigned to 5 treatments: 1. Positive control: diet formulated to meet or exceed the nutrient requirement of pigs (PC); 2. Negative control: PC diets formulated with 0, 11% lower Ca and 0, 13% lower available P (NC); 3. NC + 1, 500 FYT of phytase; 4. NC + 3, 000 FYT of phytase; 5. NC +4, 500 FYT of phytase. The corn-soybean meal-based diets were formulated to be iso-nutrient and isoenergetic, except for Ca and av. P. The 4 diets were formulated according to a growing I (71-94 days of age), growing II (95-115d), finishing I (116-143 d) and finishing II (144-156 d) phases. Carcass traits were measured and submitted to the European Carcass Classification (SEUROP). Performance and carcass data were submitted to ANOVA, and regression analysis. There was a quadratic effect on FCR (P< 0.05) in growing I phase, ; better FCR (quadratic, P< 0.05) on finishing II to 1, 500 and 3, 000 FYT (5.56 and 0.35%, respectively); an increase of 5.43 and 1.52% DWG in finishing II (quadratic, P< 0.05) and a reduced 6.60% to 4, 500FYT; an improvement the total DWG and final weight (quadratic, P< 0.05) in 6.19 and 4.52%, and 5.27 and 3.57%, for 1, 500 and 3, 000 FYT, respectively. Phytase supplementation did not improve Carcass weight (P >0.05). The animals fed with 4, 500 FYT diet had more carcasses classified as E (between 55–60% lean meat-SEUROP) compared other groups. Doses between 1, 500 and 3, 000 FYT improve FCR, DWG and final LW of growing and finishing pigs.