730_Lab - Kevin Flock Craig Fuller Renee Griffith Daniel...

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Kevin Flock, Craig Fuller, Renee Griffith, Daniel Helle, Sara Kaniewski Animal Science 324 7:30 0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 G:F Wk 1 Wk 2 Wk 1-2 Week Diet 1 Diet 2 Diet 3 0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 ADFI, g Wk 1 Wk 2 Wk1-2 Age Diet 1 Diet 2 Diet 3 0.00 10.00 20.00 30.00 40.00 50.00 60.00 ADG, g Wk 1 Wk 2 Wk 1-2 Diet 1 Diet 2 Diet 3 Introduction: The most recent NRC (1994) lists the tryptophan requirement for 0-3 week old broilers as .2%. Research suggests that feed intake and weight gain were decreased as tryptophan was increased, according to Baker et. al (1996). But other research shows increasing tryptophan (.2%-.25) may increase BW of broilers. A decrease in tryptophan (.11%-.13% unit decrease) in the diet will decrease total BW and ADG (Russell and Harms 1999). Other research suggests that tryptophan should be increased to .25% of the diet in order to increase ADG (ROSA and Pesti 2001). Recent research also suggests that any concentration of soy hulls will decrease ADG (Lee 2003). Therefore, we hypothesized that adding 7.5 % soybean hulls or increasing dietary tryptophan concentration, would reduce the ADG of the 0-2 week old broiler chicken. To test this hypothesis, 30 male broilers obtained on the day of hatch were used in a 14 day experiment to determine if adding soybean hulls would slow ADG. In addition we determined that by increasing the dietary tryptophan concentration (.39%) would reduce ADG. Materials and Methods: • 30 Male broilers were obtained on the day of hatch • Chicks were fed a starter diet for 1 day • Birds were randomly allotted to petersime battery cages with nipple and jar waterers, and trough feeders. • 5 birds were housed per pen with 2 pens per diet • Allowed ad libitum access to both feed and water • All diets were corn and soybean meal based, and formulated to meet or exceed all nutrient requirements (NRC, 1994). • Diets 1, 2, and 3 were formulated to contain a 3200 kcal/kg ME • Dietary treatments: Diet 1 met the requirements of the NRC (1994) and was considered the control for the group. Diet 2 contained the addition of soybean hulls at an inclusion rate of 7.5%. Diet 3 contained an increase of tryptophan at an inclusion rate of .13%. This increased the level of tryptophan to .39% with the NRC being .2%. • Pen BW and feed intakes were recorded weekly • Birds were checked daily for health and feed intake • Pen was the experimental unit • Diet means were composed using T-test procedure of Excel Diet Table 1. Composition of dietary treatments in experiment Ingredients, % Diet 1 Diet 2 Diet 3 Corn 59.28 52.3 59.03 Soybean meal 48% 29.82 20.16 29.84 Soy Oil 5.2 9 5.3 Soybean hul s 0 7.5 0 Fish meal 0 7.12 0 Dical Phosphate 1.95 1.01 1.95 Limestone 1.38 1.02 1.38 Premix* 2.37 1.89 2.5 P, % 0.73 0.67 0.74 Trp, % 0.26 0.23 0.39 Calculated Composition Diet 1 Diet 2 Diet 3 CP, % 20.8 18.95 20.19 Lys, % 1.1 1.1 1.1 ME, Kcal/Kg 1455 1455 1455 Ca, % 1 1 1 Results: Abstract: An experiment was conducted to determine the effects of an increase in Trp or soybean hulls in order to decrease the growth of 0-2 week old broilers. Diet one was a corn-soybean meal based diet that served as a control for the experiment. Diet two contained soybean hulls at an inclusion rate of 7.5%, and diet three contained a significant
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730_Lab - Kevin Flock Craig Fuller Renee Griffith Daniel...

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