The Constancy of Hatching Power in Hens

Hyre, H. M.; Hall, G. O.

doi:10.3382/ps.0110166

Cited by 7 publications

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“…Comparison of the results of Erasmus (1954 a) and the hatchability records of the Poultry Research Centre flock suggests that the optimal porosity coefficient for maximal hatchability under our conditions is about 2-2. Eggs from the aged hens gave values of about one and a half times this, which would suggest that the decreased hatchability with increased age of the hen observed by Hyre & Hall (1932) and Greenwood (1932) might, to some extent at least, be due to an increased rate of water loss during incubation. If this assumption is valid, an increase of humidity inside the incubator may decrease the rate of water loss and improve hatchability.…”

Section: Discussionmentioning

confidence: 82%

The effect of the age of the hen on the porosity of the egg

Bolton

1957

J. Agric. Sci.

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1. The rate of loss of weight has been determined for eggs from aged hens and from pullets by methods which used both an incubator at 102° F. and a desiccator at room temperature.2. For both lots of eggs the weight loss per unit area of shell was about three times greater in the incubator than in the desiccator.3. For the same method the eggs from the aged hens lost one and a half times as much weight per unit area as the eggs from pullets.

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Section: Discussionmentioning

confidence: 82%

The effect of the age of the hen on the porosity of the egg

Bolton

1957

J. Agric. Sci.

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“…Greenwood (1931-32) found that pullets [10S] at Univ of Iowa-Law Library on May 31, 2015 http://ps.oxfordjournals.org/ Downloaded from and yearling females gave practically the same results whereas three, four, and seven year old birds gave lower hatchability. In a group of 202 White Leghorns, Hyre and Hall (1932) observed a slightly significant difference in hatchability in favor of yearlings over the same birds as pullets. In another group, comprising 633 White Leghorns, all birds were first bred in their second year and again in their third year and then 219 were again bred in their fourth year, 85 in their fifth year, and 34 in their sixth year.…”

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confidence: 88%

Reproductive Ability and Viability of Progeny in Relation to Age of Sires and Dams

Jull¹

1935

Poultry Science

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T HE proportion of pullets in a flock and the amount of culling necessary are factors that determine the proportion of the flock to be replaced each year. It is important, therefore, to determine the relative merits of pullets and older birds from the standpoint of their reproductive ability and the viability of their progency. If it can be shown that dams giving good results the first year they are bred will also give good results in succeeding years, it is apparent that fewer of the breeding stock need be replaced each year. The existing literature dealing with this problem is confined, for the most part, to the relationship of the age of breeding stock to hatchability. In this paper, however, reproductive ability takes into consideration the fertility of eggs as well as their hatchability.The literature dealing with fertility in relation to the age of sires and dams has already been discussed in a previous paper by Jull (1935), where it was pointed out that: (1) The fertility of pullets and the same females as yearlings mated to cockerels each year did not differ significantly;(2) the fertility of yearling dams and the same females as three-year old birds mated to cockerels each year did not differ significantly; (3) females having relatively high fertility the first year they were bred tended to have relatively high fertility the second year they were bred; (4) the fertility of White Leghorn sires first used as cockerels and then as yearlings did not dif-fer significantly, whereas in Rhode Island Reds the difference was significant.Hatchability of eggs in relation to the age of the breeding stock has been studied by a few investigators, the results being based upon the percentage of chicks hatched from a given number of fertile eggs. Stewart and Atwood (1909) found that White Leghorn hens two and three years old gave better results than pullets, and Pearl and Surface (1909) found that yearling Barred Plymouth Rock hens gave, slightly though not significantly better hatchability than pullets; but Pearl (1917) found that reproductive ability decreased with advancing age of the breeders. Kempster (1921) found that White Leghorn hens gave a slightly better hatchability than pullets. Richardson (1925) reported that 95 percent of the commercial poultrymen of New Hampshire use pullets as breeders. Hays and Sanborn (1924) found that Rhode Island Red pullets gave significantly better hatchability than the same birds did as yearlings. Hays (1928) observed that in two series of experiments involving Rhode Island Red cockerels and the same birds as yearlings the hatchability of the birds in their yearling year was better than in their first year. It was also noted that yearling hens gave somewhat better results than they did as pullets, although the number of observations was limited.Greenwood found that pullets [10S] at Univ of Iowa-Law Library on May 31, 2015 http://ps.oxfordjournals.org/ Downloaded from

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“…Lamoreux (1940) in his extensive studies on fertility reported a number of hens that laid few or no fertile eggs from unknown causes. Hyre and Hall (1932) pointed out that among the Cornell Leghorns there was a relatively large number of hens that gave zero fertility. Blyth (1945) reemphasized a view that had been held by others to the effect that so-called low fertility may be largely attributed to very early embryonic death.…”

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confidence: 97%

Is Fertility in Domestic Fowl Regulated by Inheritance?

Hays

1950

Poultry Science

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The Constancy of Hatching Power in Hens

Cited by 7 publications

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The effect of the age of the hen on the porosity of the egg

The effect of the age of the hen on the porosity of the egg

Reproductive Ability and Viability of Progeny in Relation to Age of Sires and Dams

Is Fertility in Domestic Fowl Regulated by Inheritance?

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