Zobrazeno 1 - 10
of 43
pro vyhledávání: '"F. B. Mather"'
Publikováno v:
Journal of Applied Poultry Research. 12:14-23
One of the factors contributing to failure of avian embryos to hatch is the positioning of the embryo at the end of incubation in such a manner that emergence from the egg is inhibited. Abnormal positions, or malpositions, may also be associated with
Publikováno v:
Journal of Applied Poultry Research. 8:146-151
Two experiments were conducted to study the effects of various levels of feed restriction on the performance of Hy-Line W-36 hens at 56 and 79 wk. Nutrient levels (with the exception of energy) increased as the level of feed restriction increased. Eg
Publikováno v:
Poultry Science. 75:924-932
A series of experiments was conducted to estimate phenotypic correlations between incubation characteristics, and to evaluate the effects of cold stress and genotype during incubation on chick weight, egg weight loss, hatching time, and embryonic mor
Publikováno v:
Poultry Science. 72:2044-2051
The objective of this study was to characterize how the physical attributes associated with sexual maturity would be affected by feed allocation as female broiler breeders passed through the pullet-layer transition period. Treatments consisted of fiv
Autor:
R. A. Ernst, F. B. Mather
Publikováno v:
Journal of Applied Poultry Research. 1:291-295
The age at which sexual maturity occurs in layers can affect flock performance, egg size, and flock income. In this study, Hy-Line W-36 pullets were moved to the lay house and light stimulated at 126, 136 or 146 days of age. Egg production, egg size
Publikováno v:
Comparative Biochemistry and Physiology Part A: Physiology. 102:289-293
1. 1. The relationship between seasonal changes in environmental temperature and hematological parameters was investigated in mature, single comb white leghorn (SCWL) male chickens. 2. 2. Samples of blood plasma, obtained monthly from two groups of b
Publikováno v:
Journal of Applied Poultry Research. 1:95-103
The effects of in-house sampling locations, type of scale, and time of weighing on apparent mean body weight, body weight gain and uniformity were determined for broiler and broiler breeder stock. Deviations in time of weighing were shown to be an im
Publikováno v:
Journal of Applied Poultry Research. 1:88-94
Evaluations were made of the effects of sample size and individual vs. group weighing of broiler and broiler breeder stock on the estimation of body weight gain and uniformity. Results indicated that suspected outliers should not be rejected from the
Publikováno v:
Agricultural Systems. 32:197-205
This study simulated broiler grower conditions by incorporating environmental variation into the research design. This provided a means for partitioning growers into homogeneous production environments (recommendation domains). Also, it enabled a mor
Publikováno v:
Poultry science. 76(7)
Two experiments were conducted to evaluate effects of strain [five in Experiment (Exp.) 1 and six in Exp. 2)] and age (29, 47, and 57 wk in Exp. 1 and 29, 41, and 52 wk in Exp. 2) of commercial broiler breeders on incubation time and chick weight. Hi