scholarly journals Evidence that Early Sexual Maturity May Increase Early Growth Rate in Rhode Island Red Pullets

1951 ◽  
Vol 30 (5) ◽  
pp. 775-777 ◽  
Author(s):  
F.A. Hays
Keyword(s):  
Growth Rate ◽  
Rhode Island ◽  
Sexual Maturity ◽  
Early Growth

scholarly journals Minimum Weight for Onset of Sexual Maturity in Female Chickens: Heritability and Phenotypic and Genetic Correlations with Early Growth Rate

1984 ◽  
Vol 63 (11) ◽  
pp. 2103-2113 ◽  
Author(s):  
M. SOLLER ◽  
T. BRODY ◽  
Y. EITAN ◽  
T. AGURSKY ◽  
C. WEXLER
Keyword(s):  
Growth Rate ◽  
Sexual Maturity ◽  
Minimum Weight ◽  
Genetic Correlations ◽  
Early Growth

scholarly journals The Columbian Restriction Gene, Co, and Early Growth Rate in the Domestic Fowl

1984 ◽  
Vol 63 (3) ◽  
pp. 586-588
Author(s):  
THOMAS W. FOX ◽  
J. ROBERT SMYTH
Keyword(s):  
Growth Rate ◽  
Domestic Fowl ◽  
Early Growth

Erratum: Size at onset of sexual maturity and growth rate in crustacean populations

1975 ◽  
Vol 53 (3) ◽  
pp. 360-360
Author(s):  
Adrian M. Wenner ◽  
Craig Fusaro ◽  
Allan Oaten
Keyword(s):  
Growth Rate ◽  
Sexual Maturity

scholarly journals Effects of feed restriction on metabolic disorders in broiler chickens: A review

2014 ◽  
Vol 30 (1) ◽  
pp. 1-13 ◽  
Author(s):  
M. Sahraei
Keyword(s):  
Growth Rate ◽  
Broiler Chickens ◽  
Broiler Chicken ◽  
Metabolic Disorders ◽  
Production Efficiency ◽  
Early Growth ◽  
Fast Growth ◽  
Feed Consumption ◽  
Feed Restriction ◽  
Fast Growth Rate

Continuous genetic selection and improvement in nutrition have led to a very fast growth rate in modern strains of broiler chickens. Metabolic disorders such as ascits, sudden death syndrome and leg problems are related to a rapid early growth rate in poultry, especially in broilers, and their incidence can be decreased by slowing early growth. The use of management tools to reduce metabolic disorders that rely primarily on decreasing feed consumption, The feed restriction programs is on of the main techniques in growth curve manipulation for increasing production efficiency in broiler chicken in alleviate the incidence of some metabolic disorders and can be used to reduction the unfavorable effects of fast growth rate in broiler chicken production industry, and could be profitable in broiler chickens production efficiency. This article implicated on new findings in about different feed restriction programs effects on these problems in broiler chickens.

Adptatives Responses of the Species Ethmalosa fimbriata in Biétri Bay, a Highly Disturbed Environment

2021 ◽  
Vol 12 (1) ◽  
pp. 48
Author(s):  
Moussa Side ◽  
Eby Yoboué Gnamma Honorine Alla ◽  
Behiri Innocent Kakou ◽  
Béatrice Abouo Adepo-Gourene
Keyword(s):  
Growth Rate ◽  
Sexual Maturity ◽  
Reference Site ◽  
Growth Parameters ◽  
The Other ◽  
Other Hand ◽  
Males And Females ◽  
Disturbed Environment

The growth and size at first sexual maturity of the species Ethmalosa fimbriata were studied in two sites in the Ebrié lagoon: Bietri, a highly anthropized environment and Vitré 2, a reference site. Growth parameters estimated from size frequencies showed that growth in both size and weight was faster in females than in males regardless of habitat. On the other hand, specimens from Biétri bay have a slower growth rate than those from Vitré 2. In Bietri bay, individuals are characterized by early sexual maturity. They reach sexual maturity at the age of 0.55 years (about 7 months), corresponding to a size of 6.13 cm for males and 8.42 cm for females; whereas in Vitré 2, they reach sexual maturity at the age of 0.82 years (about 10 months) corresponding to a size of 10.22 cm and 12.94 cm for males and females respectively. These results show that in a highly antropic environment, the growth of Ethmalosa fimbriata is affected and individuals reproduce earlier.

Heritability Estimates for Juvenile Body weight by Least Squares and DFREML in a Commercial Broiler Breeder Dam Population

1994 ◽  
Vol 1994 ◽  
pp. 51-51
Author(s):  
A.J. Morris ◽  
G.E. Pollott
Keyword(s):  
Growth Rate ◽  
Body Weight ◽  
Least Squares ◽  
Production Efficiency ◽  
Early Growth ◽  
Broiler Breeder ◽  
Derivative Free ◽  
Commercial Broiler ◽  
Body Weight Measure ◽  
Different Sources

To date commercial broiler breeders have focused primarily on increasing early growth rate in selection programmes aimed at improving overall production efficiency. In commercial programmes, early growth rate is simplified to a single body weight measure taken at a fixed age during the growth phase approaching common slaughter weights. Most recent selection studies report heritabilities from experimental populations that are at best, synthesised from crossing modern broiler material from several different sources (Leenstra et al, 1986; Wang et al, 1991). Therefore, such populations are likely to exhibit greater heterozygosity than many commercial lines which have undergone many generations of intense selection in closed populations. This paper reports heritabilities estimated using both least squares and derivative-free maximum likelihood techniques for data from a commercial breeder dam line which has remained closed since its inception in 1975.

The effect of fin-clipping on growth rate, survival and sexual maturity of rainbow trout

Aquaculture ◽  
1988 ◽  
Vol 73 (1-4) ◽  
pp. 383-389 ◽  
Author(s):  
Bjarne Gjerde ◽  
Terje Refstie
Keyword(s):  
Growth Rate ◽  
Rainbow Trout ◽  
Sexual Maturity

Ecological Traits of the Eucalyptus L'hérit Subgenera Monocalyptus and Symphyomyrtus

1989 ◽  
Vol 37 (3) ◽  
pp. 207 ◽  
Author(s):  
IR Noble
Keyword(s):  
Growth Rate ◽  
Growth Rates ◽  
Root Morphology ◽  
Related Species ◽  
Early Growth ◽  
Growth Patterns ◽  
Leaf Chemistry ◽  
Ecological Traits ◽  
Closely Related Species ◽  
Genus Eucalyptus

The genus Eucalyptus L'Hérit. dominates most of the forests and woodlands of Australia. Many stands consist of intimate mixtures of species from different subgenera. The ecological traits of the two largest subgenera, Symphyomyrtus and Monocalyptus, are reviewed. Consistent differences in herbivore and parasite damage to leaves; in water relations; in tolerance to waterlogging, flooding, salinity and frost; in nutrient usage; in response to Phytophthora cinnamorni; and in early growth patterns are described. These can be summarised as differences in leaf chemistry; in root morphology, chemistry and activity; and in early growth rates. It is suggested that the differences in the ecological traits, and especially in the early growth rate, may help explain the coexistence of closely related species of similar habits in eucalypt communities.

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