Effects of protease enzyme supplementation in weanling pigs’ diet with different crude protein levels on growth performance and nutrient digestibility
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The purpose of this study is to determine the impact of different levels of crude protein (CP)diets supplemented with dietary protease on the growth performance and nutrient digestibilityof the weanling pigs. In a 5-week study, 100 crossbred ([Landrace × Yorkshire] × Duroc) ofweaner pigs that have an average initial body weight (BW) of 7.17±1.06 kg were assignedto one of four dietary treatments with 5 replications and 5 pigs (3 gilts and 2 castrated malepigs) per pen in a randomized complete block design. The dietary treatments were as follows:Phase 1: CON: basal diets (20.60% CP); low protein (LP): CON − 0.30% CP; PLP1:(CON − 0.30% CP) + 0.05% protease; PLP2: (CON − 0.50% CP) + 0.05% protease. Phase2: CON: basal diets (18.88% CP); LP: CON − 0.30% CP; PLP1: (CON − 0.30% CP) + 0.05%protease; PLP2: (CON − 0.50% CP) + 0.05% protease. The addition of protease to low CPdiets significantly increased the feed conversion ratio (FCR) (p = 0.039), BW (p = 0.046), averagedaily gain (ADG) (p = 0.049), and average daily feed intake (ADFI) tended to increase(p = 0.053) in the young pigs during phase 1. However, FCR tended to increase throughoutthe experiment but did not change during phase 2, whereas BW, ADG, and ADFI stayed unchangedthroughout phase 2 and overall. There was no significant difference in dry matter,nitrogen (N), and gross energy of nutrient digestibility in all phases and overall in weanedpigs with low CP when protease was fed. In contrast, adding protease to the low CP diets increasedthe tendency of N digestibility (p = 0.059) during phase 1. It is concluded that dietaryprotease supplementation tended to increase N retention during the first phase of the weaningperiod, hence increasing piglet performance.
Abstract
The purpose of this study is to determine the impact of different levels of crude protein (CP)diets supplemented with dietary protease on the growth performance and nutrient digestibilityof the weanling pigs. In a 5-week study, 100 crossbred ([Landrace × Yorkshire] × Duroc) ofweaner pigs that have an average initial body weight (BW) of 7.17±1.06 kg were assignedto one of four dietary treatments with 5 replications and 5 pigs (3 gilts and 2 castrated malepigs) per pen in a randomized complete block design. The dietary treatments were as follows:Phase 1: CON: basal diets (20.60% CP); low protein (LP): CON − 0.30% CP; PLP1:(CON − 0.30% CP) + 0.05% protease; PLP2: (CON − 0.50% CP) + 0.05% protease. Phase2: CON: basal diets (18.88% CP); LP: CON − 0.30% CP; PLP1: (CON − 0.30% CP) + 0.05%protease; PLP2: (CON − 0.50% CP) + 0.05% protease. The addition of protease to low CPdiets significantly increased the feed conversion ratio (FCR) (p = 0.039), BW (p = 0.046), averagedaily gain (ADG) (p = 0.049), and average daily feed intake (ADFI) tended to increase(p = 0.053) in the young pigs during phase 1. However, FCR tended to increase throughoutthe experiment but did not change during phase 2, whereas BW, ADG, and ADFI stayed unchangedthroughout phase 2 and overall. There was no significant difference in dry matter,nitrogen (N), and gross energy of nutrient digestibility in all phases and overall in weanedpigs with low CP when protease was fed. In contrast, adding protease to the low CP diets increasedthe tendency of N digestibility (p = 0.059) during phase 1. It is concluded that dietaryprotease supplementation tended to increase N retention during the first phase of the weaningperiod, hence increasing piglet performance.
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