Korean Journal of Poultry Science (한국가금학회지)

The Korean Society of Poultry Science (한국가금학회)
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Feeding a Diet with Precise Lysine Level improved Laying Performance and Feed Efficiency of Broiler Breeder Hens at the Early Laying Stage

  • Kim, Eunjoo (Department of Animal Science and Biotechnology, Chungnam National University) ;
  • Rew, Han-Jin (Department of Animal Science and Biotechnology, Chungnam National University) ;
  • Wickramasuriya, Samiru Sudharaka (Department of Animal Science and Biotechnology, Chungnam National University) ;
  • Lee, Soo Kee (Department of Animal Science and Biotechnology, Chungnam National University) ;
  • Shin, Taeg Kyun (Department of Animal Science and Biotechnology, Chungnam National University) ;
  • Cho, Hyun Min (Department of Animal Science and Biotechnology, Chungnam National University) ;
  • Heo, Jung Min (Department of Animal Science and Biotechnology, Chungnam National University)
  • Received : 2017.09.25
  • Accepted : 2017.12.27
  • Published : 2017.12.31
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Abstract

A dose-response experiment was conducted to determine the lysine requirement for broiler breeder hens during pre-peak production. Totally, one hundred and twenty-six flock 23-week-old Ross 308 broiler breeder hens with similar body weight were selected ($2,188{\pm}32g$) for a 6-week experiment. Hens were fed with a basal diet of corn-wheat-soybean meal formulated to achieve the Ross 308 breeder nutrient specifications (2016), except for lysine. The 7 graded, daily lysine intake levels used in this experiment were 732, 785, 838, 891, 944, 997, and 1,050 mg, and hens were restricted to 133 g of feed throughout this experiment. Pen based egg production were recorded once a day and all eggs were weighed daily. Age at sexual maturity was determined when the hens attained age at 25% production. Body weight at 23~29 weeks of age was not affected (P>0.05) by lysine levels. By fitting a linear-plateau model, the daily lysine requirements for feed conversion ratio, total produced egg weight, and age at sexual maturity at 23~29 weeks of age were estimated as 865, 907, and 891 mg, respectively. Using a quadratic-plateau model, the daily lysine requirement at 23~29 weeks of age were estimated as 974, 964, and 950 mg for feed conversion ratio, total produced egg weight, and age at sexual maturity, respectively. These results suggested that the daily lysine requirement for modern broiler breeder hens according to the National Research Council (1994) are insufficient for higher total produced egg weight, sexual maturity, and feed efficiency, and 120% of the NRC recommendation level would improve hen productivity when data are fitted under linear- and quadratic-plateau models.

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References

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