MICROMINERAL-VITAMIN SUPPLEMENT, INGARNIC PHOSPHORUS REDUCTION AND PHYTASE ADDITION IN FINISHING RATIONS FOR SWINE
DOI:
https://doi.org/10.5216/cab.v9i3.4939Keywords:
Produção de SuínosAbstract
The experiment aimed to evaluate the effect of mineral-vitamin supplement withdrawal associated to inorganic phosphorus and phytase addition on swine performance and carcass characteristics in finishing phase.48 hybrid swine females with initial average weight of 66,34 kg and final average weight of 106,14 kg were housed in 24 stalls for 38 days and allotted to a completely randomized experimental design with six treatments (T1 – basal feed; T2 – basal feed without mineral vitamin supplement; T3 – basal feed without mineral vitamin supplement with phytase; T4 – basal feed without mineral vitamin supplement less1/3 of inorganic phosphorus with phytase; T5 - basal feed without mineral vitamin supplement less 2/3 of inorganic phosphorus with phytase and T6 – basal feed without mineral vitamin supplement and inorganic phosphorus with phytase) with four replications of two animals each. Daily weight gain, total average weight gain and feed:gain ratio were determined and carcass characteristics were evaluated: loin eye area, backfat depth, carcass length, carcass weight and carcass yield. Although reduction in inorganic phosphorus levels or phytase addition had no influence in carcass characteristics (P>0,05), there was significant effect in performance (P<0,05), resulting in less average feed intake, weight gain and feed:gain ratio. Likewise, reduction in inorganic phosphorus levels or phytase addition under the conditions of this trial did not improve economic efficiency when compared to basal feed.
KEY WORDS: Finishing phase pig, phosphorus, phytase.
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