Second Year Egg Production in Relation to First Year Egg Production in the Domestic Fowl
نویسندگان
چکیده
منابع مشابه
The Correlation between First- and Second-Year Egg Production in the Domestic Fowl.
INTRODUCTION. .......... ....................................................... Historical. ..................................................................... Materials and methods. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Analysis of data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....
متن کاملThe Correlation between Egg Production during Various Periods of the Year in the Domestic Fowl.
INTRODUCTION ................................................................. 27 PRESENTATION OF RESULTS ...................................................... 29 The correlation between monthly egg record and annual egg production.. .. 29 The correlation between monthly egg record and the total production of the remaining eleven months .............................................. 44 The cor...
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A study of 1231 first cycle and 887 second cycle table egg flocks (by Bell and Adams) in the early 1980’s in California revealed a series of very important relationships. These relationships are essential to the decision of whether or not flocks should be molted and if so, when? If molting is to pay, the second cycle of production must yield high performance compared to a one cycle option. The ...
متن کاملRegression in Egg Production in the Domestic Fowl When Selection Is Relaxed.
T H E question of what happens to egg production when selection is relaxed in commercial strains of chickens selected over many generations for high performance is of practical importance because of the economic implications to commercial breeding practice. Breeders would like to know whether the genetic gains they have made over many years of selection can be maintained in flocks with no furth...
متن کاملSelection for egg production and correlated responses in the fowl.
HE effectiveness of selection for genetic improvement of egg production in the fowl remains a controversial issue. Mass selection on annual egg records has long been regarded as ineffective as demonstrated by the early work of PEARL (1915), while selection based on family records and progeny testing has seemed to be the key to success as demonstrated by the long-time selection experiments of DE...
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ژورنال
عنوان ژورنال: Poultry Science
سال: 1928
ISSN: 0032-5791
DOI: 10.3382/ps.0070276