Zobrazeno 1 - 10
of 36
pro vyhledávání: '"Marlow, W"'
Autor:
Marlow W. Olsen
Publikováno v:
Poultry Science. 51:2035-2039
Parthenogenetic tests, involving 345 young, virgin Beltsville Small White (B.S.W.) turkey hens and 15,131 unfertilized eggs, were conducted during 1970 and 1971. The hens involved were daughters of inbred and outbred sires and dams and represented pr
Autor:
Marlow W. Olsen
Publikováno v:
Poultry Science. 18:232-235
SINCE it has become an established fact that egg production is to a considerable extent inherited, it is necessary, if one is to carry out a progressive breeding program, to know something of the inherent production qualities of each bird. In order t
Autor:
T. C. Byerly, Marlow W. Olsen
Publikováno v:
Poultry Science. 14:46-53
THIS paper presents the results of one phase of a group of experiments and observations to determine the causes of malposition in chick embryos at hatching time. Malposition is one of the chief immediate causes of embryo mortality in the domestic fow
Autor:
Marlow W. Olsen, Stanley J. Marsden
Publikováno v:
Poultry Science. 29:548-553
CONSIDERABLE losses occur every season as a result of low fertility and hatchability of eggs among the strains of Broad Breasted Bronze turkeys that now constitute the majority of the turkeys raised in the United States. It is estimated that of each
Autor:
Marlow W. Olsen, T. C. Byerly
Publikováno v:
Poultry Science. 12:261-265
THE data presented by Byerly and Olsen (1931) indicated that from 2 to 3.5 percent of all fertile eggs incubated contain at hatching time dead chicks with their heads in the small instead of the large end of the shell. In order to save the poultry in
Autor:
Marlow W. Olsen
Publikováno v:
Poultry Science. 30:180-183
A NUMBER of studies have been made of the effect of low holding temperatures on the hatchability of hens’ eggs. In general, these studies have shown that embryonic mortality is high after eggs have been subjected to storage temperatures of 40 degre
Autor:
T. C. Byerly, Marlow W. Olsen
Publikováno v:
Poultry Science. 10:281-287
Sanctuary, (1925), Hutt (1929), Smith (1930), Hale (1930), and Byerly (1930), have reported and discussed data on malposition in the chick embryo, but no experimental work on the cause of malposition has come to the author’s attention. The present
Autor:
Marlow W. Olsen, Stanley J. Marsden
Publikováno v:
Poultry Science. 35:674-682
EXPERIMENTS at the Agricultural Research Center, Beltsville, Maryland, over the past four years have repeatedly demonstrated that parthenogenesis occurs in infertile turkey eggs. The original observations made in 1952 revealed that 156 or 16.7 percen
Autor:
R. M. Fraps, Marlow W. Olsen
Publikováno v:
Journal of Morphology. 74:297-309
Autor:
Marlow W. Olsen, S. K. Haynes
Publikováno v:
Poultry Science. 28:198-201
A MAJOR factor in the cost of production of chicks is the excessive loss of eggs which fail to hatch. It has been estimated that approximately 30 eggs of every hundred placed in commercial incubators fail to hatch. Approximately one half of the eggs