scholarly journals Effects of consecutive thiouracil exposures in the juvenile and adult single comb White Leghorn chicken on body weight and reproductive performance

1997 ◽  
Vol 76 (2) ◽  
pp. 236-243 ◽  
Author(s):  
ED Peebles ◽  
EH Miller ◽  
CR Boyle ◽  
JD Brake ◽  
MA Latour ◽  
...  
Keyword(s):  
Body Weight ◽  
Reproductive Performance ◽  
White Leghorn ◽  
White Leghorn Chicken ◽  
Single Comb

scholarly journals Quantitative and Qualitative Protein Changes in the Developing Single Comb White Leghorn Chicken Embryo

1972 ◽  
Vol 51 (1) ◽  
pp. 313-320 ◽  
Author(s):  
J.A. Asmar ◽  
P.L. Pellett ◽  
Nur Hariri ◽  
M.D. Hariri
Keyword(s):  
Chicken Embryo ◽  
White Leghorn ◽  
White Leghorn Chicken ◽  
Single Comb

SUBSTITUTION OF SORGHUM FOR WHEAT IN DIETS FOR LAYING HENS

1982 ◽  
Vol 62 (1) ◽  
pp. 305-306 ◽  
Author(s):  
E. E. GARDINER ◽  
D. J. MAJOR ◽  
S. DUBETZ
Keyword(s):  
Body Weight ◽  
Key Words ◽  
Egg Production ◽  
Laying Hens ◽  
Feed Consumption ◽  
White Leghorn ◽  
Egg Weight ◽  
Single Comb

The effects of substituting various levels of sorghum for wheat in diets for laying hens were studied. Egg production, egg weight, feed consumption, body weight and hatchability of eggs from Single Comb White Leghorn hens were not affected by the proportion of sorghum in the diet. Key words: Sorghum, wheat, nutrition, egg production

scholarly journals A failure to induce heritable changes in four generations of the White Leghorn chicken by inter- and intra-specific blood transfusion

1963 ◽  
Vol 4 (2) ◽  
pp. 221-239 ◽  
Author(s):  
I. L. Kosin ◽  
Masaru Kato
Keyword(s):  
Body Weight ◽  
New Hampshire ◽  
Blood Donors ◽  
Blood Transfusions ◽  
Plumage Colour ◽  
White Leghorn ◽  
Egg Weight ◽  
Injection Period ◽  
White Leghorn Chicken ◽  
Egg Shell

1. A three-year study was conducted to test the efficacy of inter- and intra-specific blood transfusions in domestic poultry for inducing heritable changes in the recipients. The latter were pure-bred White Leghorns. Pure-bred Broad Breasted Bronze turkeys and New Hampshire chickens served as blood donors to two distinct lines of recipients. All injections started when the recipient chicks were 2–5 days old. Altogether, more than 3000 chicks from blood injected lines were involved in the study, conducted between 1959 and 1961 and distributed between the parental and three subsequent generations. Each injected chick received a total of some 155 ml. of whole blood in the course of a five-month injection period. An adequate number of control (non-injected) birds was used throughout. Observations were made on plumage colour, body-weight, egg-weight, egg-shell colour, fertility and hatchability. Furthermore, blood plasma and muscle tissue of appropriate birds were subjected to immunological, chromatographic and electrophoretic analyses.2. On the basis of all these criteria, no evidence of heritable shifts in the direction of the donor organism was discerned among birds belonging to either of the two treated lines.

Carcass traits and reproductive organ morphology in 62-week-old SCWL hens

1995 ◽  
Vol 75 (3) ◽  
pp. 341-344 ◽  
Author(s):  
H. L. Bjerstedt ◽  
F. E. Robinson ◽  
R. T. Hardin ◽  
T. A. Wautier
Keyword(s):  
Body Weight ◽  
Follicular Development ◽  
Reproductive Organ ◽  
Breast Muscle ◽  
Liver Fat ◽  
White Leghorn ◽  
Reproductive Disorders ◽  
Fat Pad ◽  
Muscle Weight ◽  
Single Comb

The influence of body weight on reproductive organ morphology and the incidence of reproductive disorders was investigated with 324 Shaver Starcross 288-strain Single Comb White Leghorn hens at 62 wk of age. The hens were fed a typical laying ration (2720 kcal ME kg−1, 16.3%, CP, 3.5% Ca) ad libitum. All birds were housed two birds per cage in a windowless poultry house, with a photoperiod of 14L:10D. The total group of hens was separated into eight weight groups, on the basis of 62-wk body weight, ranging from 1100 to 2700 g, at 200-g increments. Birds were killed by cervical dislocation and dissected to observe carcass and reproductive organ traits. The length of the shank and the weights of the breast muscle, liver, fat pad, ovary and ovarian stroma increased significantly as hen weight increased. Ovary weight was increased because of an increase in the number of large follicles, as well as an increase in the weights of individual large follicles Ovarian regression occurred more often in hens weighing less than 1700 g than in hens weighing more than 1700 g. Internal oviposition occurred most often in hens near the population body weight (1803 g). Internal ovulation occurred more often in hens more than 1900 g in body weight than in hens less than 1900 g. These data suggest that hens that are heavier than average have increased follicular development, compared with low-weight hens. Key words: Single Comb White Leghorn, abdominal fat pad weight, breast-muscle weight, body weight, ovary morphology, reproductive disorders

scholarly journals SOCIAL AND PHYSICAL ENVIRONMENTAL INFLUENCES ON CAGED SINGLE COMB WHITE LEGHORN LAYERS

1976 ◽  
Vol 56 (4) ◽  
pp. 733-738 ◽  
Author(s):  
A. E. SEFTON ◽  
D. C. CROBER
Keyword(s):  
Body Weight ◽  
Behavioral Response ◽  
Egg Production ◽  
Environmental Influences ◽  
Inbred Lines ◽  
White Leghorn ◽  
Individual Bird ◽  
Cage Size ◽  
White Leghorns ◽  
Single Comb

Pullets from two-way crosses between three highly inbred lines of Single Comb White Leghorns were housed in two sizes of commercial laying cages, two pullets per cage. Individual bird egg production records were kept when birds were 68–72 wk of age. During this period, peck order within each cage, fearfulness and body weight of each individual were determined. Differences between matings for fearfulness, body weight and egg production were not significant. However, in the case of egg production, both the mating × cage size and mating × cage tier interactions were significant. The genotype × environment interactions were interpreted to be due, in part, to varied behavioral response to the environment. Dominant birds had both a higher rate of egg production and heavier body weight than their subordinate cage mates. Birds housed in the larger cages (516 cm2 per bird) were less fearful than those in the smaller cages (412 cm2 per bird). Lower fearfulness was associated with higher egg production.

THE PHYSIOLOGICAL SIGNIFICANCE OF ANDROGEN-INDUCED OVULATION IN THE HEN

1980 ◽  
Vol 84 (1) ◽  
pp. 163-171 ◽  
Author(s):  
F. CROZE ◽  
R. J. ETCHES
Keyword(s):  
Body Weight ◽  
Effective Dose ◽  
Physiological Role ◽  
Laying Hen ◽  
Physiological Significance ◽  
White Leghorn ◽  
Blood Samples ◽  
Induced Ovulation ◽  
Single Comb

The ovulation-inducing property of androgens in the laying hen was investigated. In a first experiment, four different androgens were injected subcutaneously into single-comb White Leghorn hens on the day of the last oviposition of a sequence. The hens were killed 10 h later and examined for the presence of an ovum in the oviduct. Testosterone induced ovulation in accordance to the dose injected (median effective dose, 966 ± 193 μg/hen) but the responses to 5α-dihydrotestosterone and 5α-androstane-3α, 17β-diol were not dose-related. The effect of 4-androstene-3,17-dione was more like that of progesterone since it induced ovulation 2 h earlier than the three other androgens. The physiological significance of the ovulation response to an injection of testosterone was examined in more detail in experiment 2. Seven out of ten hens which were injected with 1 mg testosterone/kg body weight ovulated within 10 h after the injection. Blood samples were taken at hourly intervals and the concentrations of testosterone and progesterone were determined by radioimmunoassay. An injection of testosterone produced an increase in the concentration of testosterone in plasma which was considerably greater and occurred earlier than the preovulatory increase of testosterone in the control birds. The increase in the concentration of progesterone in the hens injected with testosterone was similar in magnitude but occurred earlier than the spontaneous preovulatory increase of progesterone in the control hens. The possible physiological role of testosterone in the ovulation cycle is discussed.

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