17 research outputs found
The interactive effects of turbozyme 160 and diet complexity on starter pig growth performance
These results suggest that feeding a complex starter diet improves initial (d 0 to 7 postweaning) growth performance of segregated early-weaned pigs. Feeding either a simple or complex diet with added Turbozyme 160 improves feed efficiency from day 0 to 14 postweaning. However, for the overall experimental period, neither a
complex diet nor added Turbozyme 160 had any effect on growth performance
Determining the optimal threonine:lysine ratio in starter diets for the segregated early-weaned pig
A 14-day growth trial was conducted to
determine the threonine: lysine ratio necessary to optimize growth performance of the segregated early-weaned (SEW) pig. Twelve
experimental diets included two levels of
lysine (1.15% and 1.5% apparent digestible
lysine) and six apparent digestible threonine: lysine ratios (40, 45, 50, 55, 60, and 65 %) in a 2 x 6 factorial arrangement. Growth performance was improved by feeding 1.5% rather than 1.15% digestible lysine. Growth performance decreased linearly as the digestible threonine: lysine ratio increased. Although a significant quadratic response was not observed, this reduction in growth performance did not appear to occur until the threonine ratio exceeded 45% of lysine on an apparent digestible basis. These data indicate that the threonine requirement for the SEW pig is approximately 45% of digestible lysine
Effects of increasing zinc oxide on starter pig growth performance
Four hundred and twenty pigs (initially 9.8 lb and 13 d of age) were used to evaluate
the effects of increasing zinc oxide in starter diets. Results that suggest 3,000 ppm and 2,000 ppm zinc, from zinc oxide, improve growth performance in phase I and II diets, respectively
Effects of lactose sources on nursery pig growth performance
A study was conducted to evaluate different sources of pure lactose as a substitute for
spray-dried, edible-grade whey in starter
diets. Results suggest that pure lactose can
replace the lactose provided by dried whey in
phase I starter diets. However, numerical
differences in growth performance occurred
among the lactose sources used
The effects of increasing dietary energy density on growing-finishing pig growth performance and carcass characteristics
Eighty crossbred gilts were used in a growth trial to evaluate the effects of increasing dietary energy density on growing-finishing
pig growth performance and carcass characteristics. In this trial, adding fat to corn-soybean meal diets with a constant
calorie: lysine ratio to increase the energy
density during the growing phase (98 to 160 lb) improved feed efficiency with no influence on growth rate. However, increasing
the energy content of the diet by adding fat
had no benefit during the finishing phase (160 to 233 lb)
The effect of carbohydrate source and extrusion processing on growth performance on segregated early-weaned pigs
A 21-day growth trial was conducted to determine the effect of various carbohydrate
sources with or without moist extrusion processing on growth performance of segregated early-weaned pigs. Treatments included five different carbohydrate sources (corn, corn starch, rice, wheat flour, and grain sorghum) with or without moist extrusion processing in a 2 x 5 factorial arrangement. No interactions were observed among carbohydrate sources and extrusion processing. Growth performance was not improved by extrusion processing. Surprisingly, pigs fed corn had poorer growth performance compared to those fed other carbohydrate sources. These results suggest that corn starch, rice, wheat flour, and grain sorghum are suitable alternatives to corn in diets for segregated early-weaned pigs
Determining the optimal isoleucine:lysine ratio for the 25 to 50 lb pig
A 21-day growth trial was conducted to determine the isoleucine: lysine ratio necessary to optimize growth performance of the 25 to 50 lb nursery pig reared in a segregated early-weaning (SEW) system. Ten experimental diets, including two levels of lysine (.75% and 1.10% digestible lysine) and five apparent digestible isoleucine:lysine ratios (45, 50, 55, 60, and 65%), were used in a 2 x 5 factorial arrangement. Growth performance was improved by feeding 1.10% rather than .75% digestible lysine. Also, results indicated that the apparent digestible isoleucine requirement for the SEW-reared, 25 to 50 lb pig is approximately .50% of digestible lysine
Determining the optimal threonine: lysine ratio in starter diets for the segregated early-weaned pig
A 35-day growth trial was conducted to determine the threonine: lysine ratio necessary to optimize growth performance of the segregated early-weaned (SEW) pig. Twelve
experimental diets included two levels of lysine (1.15% and 1.5% digestible lysine) and
six digestible threonine:lysine ratios (50, 55, 60, 65, 70, and 75%) in a 2 x 6 factorial
arrangement. Growth performance was improved by feeding 1.5% digestible lysine, rather than 1. 15% digestible lysine. However,
growth performance was not improved by increasing dietary threonine. These data indicate that the threonine requirement is no
more than 50% of digestible lysine