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Titolo:
Growth curve analyses in selected duck lines
Autore:
Maruyama, K; Vinyard, B; Akbar, MK; Shafer, DJ; Turk, CM;
Indirizzi:
USDA, Gene Evaluat & Mapping Lab, Beltsville, MD 20705 USA USDA Beltsville MD USA 20705 luat & Mapping Lab, Beltsville, MD 20705 USA USDA, Stat Consulting Serv, Beltsville, MD 20705 USA USDA Beltsville MD USA 20705 at Consulting Serv, Beltsville, MD 20705 USA Maple Leaf Farms, Milford, IN USA Maple Leaf Farms Milford IN USAMaple Leaf Farms, Milford, IN USA
Titolo Testata:
BRITISH POULTRY SCIENCE
fascicolo: 5, volume: 42, anno: 2001,
pagine: 574 - 582
SICI:
0007-1668(200112)42:5<574:GCAISD>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
MATHEMATICAL-MODELS; MUSCLE GROWTH; BODY GROWTH; FOWL; PARAMETERS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Maruyama, K Meiji Univ, Dept Life Sci, Kawasaki, Kanagawa, Japan Meiji Univ Kawasaki Kanagawa Japan Kawasaki, Kanagawa, Japan
Citazione:
K. Maruyama et al., "Growth curve analyses in selected duck lines", BR POULT SC, 42(5), 2001, pp. 574-582

Abstract

1. Growth patterns of male ducks from 4 lines (lines A, B, C and D) selected for market weight were analysed and compared to growth patterns of ducksin the respective line 7 generations earlier. Growth curves were analysed using procedures derived from the Weibull sigmoidal function and the linear-linear relative growth rate model and simple allometry.2. The ducks were fed ad libitum under 24-h lighting throughout the experiment. At weekly intervals from the time of hatch through 70 d of age, 16 ducks from each line were killed to determine body, carcase, breast-muscle, leg and thigh-muscle, and abdominal fat weights.3. Line A was the heaviest line, followed by line B, line C and line D. However, body weight, carcase weight and breast-muscle weight at 49 d of age were not significantly different between lines A and B. After 7 generationsof selection, the breast-muscle yield was increased to >19% and the abdominal fat percent was reduced to <1.4% in all lines.4. The Weibull growth curve analysis of body weight showed an increase in the asymptotes during selection, while the age of the inflection point remained constant in all lines (21.3 to 26.0 d). For breast-muscle growth, ducks reached the inflection point 12.8 to 14.3 d later than for body weight. Between line A and line B, asymptotes for body weight, asymptotes for breast-muscle weight and allometric growth coefficients of breast muscle and leg and thigh muscles from 14 to 49 d were not significantly different.5. The relative growth rate model discriminated body and breast-muscle growth patterns of line A and line B. The initial decline in the relative bodygrowth rate was less and the time to reach the transition was longer in line A than line B. On the other hand, the initial decline in the relative breast-muscle growth rate was greater in line A than line B.

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Documento generato il 23/09/20 alle ore 13:05:56