Effect of the Insect Growth Regulator CGA-72662 (Larvadex®) on Broiler Breeder Production, Hatchability, and Subsequent Chick Performance

Abstract

Broiler breeders were fed CGA -72662 ( Larvadex ) at dosages of 0, 30, 300, and 3000 mg/kg (ppm) diet in a standard breeder diet from 25 to 65 weeks of age. The 3000 ppm level was reduced stepwise to 1000 ppm from 25 to 27 weeks due to a significant increase in male and female mortality. Feed consumption did not differ significantly due to treatment. However, birds fed 300 ppm exhibited significantly improved feed conversion and increased egg production on a hen-day basis compared to those fed 0 and 30 ppm with the 1000 ppm level intermediate. On an egg per hen-housed basis, birds fed 300 ppm produced significantly more eggs than those fed 0 ppm with 30 ppm intermediate. Hens fed 1000 ppm produced significantly fewer eggs than all other treatments due to higher initial mortality. Body weight gains for males and females among treatments were similar. Mortality was significantly greater at 1000 ppm than for all other treatments. Egg specific gravity at 50 and 60 weeks was not affected significantly by any treatment. Egg weight, when compared to the 0 ppm level, was decreased significantly at the 1000 ppm level at 50 weeks and by both 300 and 1000 ppm levels at 60 weeks. Egg shell weight was not affected significantly at 50 weeks, but was decreased significantly by both 300 and 1000 ppm Larvadex at 60 weeks. There were no significant effects due to treatment level on fertility, early deads , pipped eggs, hatchability of fertile eggs, or hatchability of eggs set.(ABSTRACT TRUNCATED AT 250 WORDS)

Effect of Protein and Energy Intake by Broiler Breeders During the Prebreeder Transition Period on Subsequent Reproductive Performance ,

“…Beginning at 24 weeks, a breeder ration (Brake et al, 1984) was fed to all treatments on a restricted basis. Feed intake, and therefore nutrient intake, was comparable during the 40-week production period that followed the prebreeder treatments (Table 2).…”

“…Recommendations of the primary breeder for feeding regimens and nutrition were followed during the growing phase to 18 weeks of age. The birds were moved to a curtain-sided breeder house at 18 weeks of age (Brake et al, 1984).…”

“…Ninety eggs selected at random from each pen were set biweekly (28 to 64 weeks) in a Jamesway Model 252B (Butler Manufacturing Co., Ft. Atkinson, WI) incubator and fertility and hatchability determined as described previously (Brake et al, 1984).…”

The Effect of Induced Molting on Water Vapor Conductance and Other Eggshell Quality Parameters of Broiler Breeders

“…Fresh egg weight, egg specific gravity, and eggshell weight were determined (Brake et al, 1984) on each egg collected. Shell thickness at the equator and pore concentration at the small end, equator, and large end of the egg were determined on all eggs by the methods of Peebles and Brake (1985a).…”

Breeder nutrition and offspring performance

“…Also the effects of synthetic compounds, as those used to control pests in poultry houses, on progeny performance have been investigated (Brake et al, 1984). It was clearly demonstrated that feeding hen with diets containing an insect growth regulator negatively affected broiler chicken performance.…”