Nutritional plans of digestible lysine for growing-finishing gilts

Abstract

-This experiment was conducted to evaluate nutritional plans of digestible lysine (DLys) for growingfinishing gilts. Eighty gilts with 63 days of age and an initial weight of 24.2±1.52 kg were distributed in a completely randomized block design, with five nutritional plans of DLys (9-8-7, 10-9-8, 11-10-9, 12-11-10, and 13-12-11 g/kg, from 63 to 103, 104 to 133, and 134 to 153 days of age, respectively) and eight replicates. Pigs were housed in pairs and fed their respective diets ad libitum throughout the experimental period (90 days). To monitor the animal development along the experiment at 103 and 133 days, gilts were weighed and subjected to analysis of ultrasound for evaluation of loin depth (longissimus dorsi) and backfat thickness. At the end of the experiment (153 days of age) the animals were weighed, and after slaughter carcasses were evaluated individually using a typifying pistol to evaluate the percentage and the content of carcass meat, loin depth and backfat thickness. From 63 to 133 days, there was no effect of the nutritional plans on daily feed intake, performance, or backfat thickness; however the loin depth was greater in the gilts that received plans with high levels of DLys (12-11; 13-12 g/kg) compared with the plan with the lowest level (8-7 g/kg). For the entire period (63 to 153 days), no influence of the nutritional plans was observed on the daily feed intake, performance variables, or carcass characteristics. A nutritional plan containing 9-8-7 g/kg of digestible lysine fed from 63 to 103, 104 to 133 and 134 to 153 days, respectively, meets the requirements for performance and carcass characteristics of growing-finishing gilts.

Sequences of digestible lysine for gilts from 60 to 148 days of age

“…This result is consistent with that of ROCHA et al (2012) who evaluated the same sequences of SIDL used in our experiment Table 2 -Growth performance and carcass traits of gilts under different nutritional plans from 60 to 148 days of age. for gilts from 63 to 153 days of age.…”

“…Experimental basal diets for each phase (Table 1) were mainly composed of corn, soybean meal, and supplements of minerals and vitamins to meet the requirements for all nutrients except SIDL (ROSTAGNO et al, 2005). The other experimental diets of each phase were obtained by supplementing L-lysine, DL-methionine, L-threonine, L-tryptophan, Table 1 -Ingredient composition of basal diets.…”

“…Values calculated based on the digestibility coef? cients of AA and ingredients, according to ROSTAGNO et al (2005).…”

“…The ideal amino acid ratios to lysine were maintained as recommended by ROSTAGNO et al (2005). Pigs had free access to feed and water throughout the experimental period.…”