Sexing Barred Rock Chicks

Gerry, R. W.; Mishler, D. H.

doi:10.3382/ps.0280479

Cited by 7 publications

(4 citation statements)

References 4 publications

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“…PROCEDURE Barred Plymouth Rock chicks were used in all of the trials. All chicks were sexed by the methods of Gerry and Mishler (1949). In Trial 1 the chicks were placed on the experimental diets at dayold.…”

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confidence: 99%

The Arginine Level for Chicks as Influenced by Ingredients

et al. 1957

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confidence: 99%

The Arginine Level for Chicks as Influenced by Ingredients

et al. 1957

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“…EXPERIMENTAL Barred Plymouth Rock chicks were used in each of the trials. All chicks were sexed at one day of age by the method of Gerry and Mishler (1949). The chicks used in Trial 1 were then wingbanded and placed on the laboratory control diet for two weeks, paired within sex on the basis of two-week weights and assigned to the experimental pens.…”

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The Tryptophan Requirement of Young Chickens as Influenced by Niacin

et al. 1952

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ALMQUIST and Mecchi (1941) re-•**• ported that the L-tryptophan requirement for optimum growth of chicks was 0.5 percent of the diet. Results obtained by Grau and Almquist (1944) indicated that the L-tryptophan requirement was 0.25 percent of the ration, and that D-tryptophan was not utilized by the chick. Wilkening and associates (1947) fed purified diets to chicks in which the major sources of protein were 12 percent of oxidized casein and 10 percent of gelatin supplemented with cystine and methionine. Using this ration with graded levels of tryptophan, the L-tryptophan requirement was reported to be 0.18 percent of the diet. observed 17 to 40 percent utilization of D-tryptophan by the chick. The tryptophan requirement for poults was reported by Bird (1950) to be 0.28 percent of the diet for optimum growth and feed efficiency to three weeks of age. It was concluded that the poults were able to utilize 38.2 percent of the D-tryptophan.Tryptophan deficiency in the chick has been described by Brown et al. (1948). Gross symptoms included emaciation, retarded comb growth and a rapid re-

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“…The accuracy of sexing the entire population was decreased by those of the intermediate phenotype and the total percentage correctly sexed was 71.7%. Gerry and Mishler (1949) observed that when B.P.R. were sexed on the basis of shank color, 266 of the total 940 chicks (28.3%) were of an indeterminant type with the remainder of the population definitely expressing the male or female phenotype.…”

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“…Macllraith and Pettit (1940) and Jeffrey and Thompson (1943) also indicated that the head spot is of prime importance, and that the shank color is a useful supplement in distinguishing the sex of the chick. Gerry and Mishler (1949) quantitatively evaluated these criteria for determining the sex of B.P.R. chicks.…”

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Sexually Dichromatic Shank Melanization Associated with the Birchen (Er) Allele

1972

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Sexually dichromatic variation in shank melanization, similar to that described in Barred Plymouth Rock chicks, was observed in the absence of sex-linked barring (B) in black-down birchen (E R ) chicks. The shanks of male chicks are uniformly pigmented. The female chicks have more darkly pigmented shanks, and pigmentation is frequently restricted in the distal portion of the shank and toes. Among chicks definitely demonstrating the male or female phenotype, 80.2% were accurately sexed. An intermediate shank type was observed in 35.1% of the total number of chicks, and these were sexed with 55.9% accuracy. A total of 71.7% of the birchen (£ E ) chicks were accurately sexed on the basis of shank color alone. This accuracy in sexing is similar to that observed in Barred Plymouth Rock chicks. ABSTRACTGross cutaneous Marek's disease lesions were found at a significantly higher frequency in the external crural feather tract than in the other tracts examined. Lesions were absent from the apteria.

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Sexing Barred Rock Chicks

Cited by 7 publications

References 4 publications

The Arginine Level for Chicks as Influenced by Ingredients

The Arginine Level for Chicks as Influenced by Ingredients

The Tryptophan Requirement of Young Chickens as Influenced by Niacin

Sexually Dichromatic Shank Melanization Associated with the Birchen (Er) Allele

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