The Growth Curve of Body Weight in Mixed-sex Rock Partridges (Alectoris graeca) Kept in captivity

Curves of growth in live-weight, from birth to 16 weeks of age, of 362 Suffolk × Welsh lambs were analysed for the effect of sex, birth type, sire and test centre environment and related to variation in age at slaughter.The relative pre-natal disadvantages of twin lambs resulted in their curves of growth differing from those of single-born animals, particularly in males. Test centre environment exerted a marked effect in such cases. At one centre, male twins showed marked compensatory growth.Differences in growth existed between the 14 sire progeny groups. As the linear component of the growth curves decreased, the quadratic values became increasingly negative. Deceleration of growth was most marked in slowest growing progeny groups and this was accentuated by a poor test centre environment.These factors combined to influence age at slaughter, which was also related to birth weight of the lamb. Lambs at the best test centre reached slaughter weight 10 and 16 days earlier than lambs at the two remaining centres. Sires produced differences in age at slaughter of 10 to 14 days, within centres.

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Breeding Biology of Brushtail Possums Trichosurus vulpecula (Marsupialia, Phalangeridae) in Captivity.

Australian Mammalogy ◽

10.1071/am95001 ◽

1995 ◽

Vol 18 (1) ◽

pp. 1

Author(s):

R.T. Gemmell

Keyword(s):

Body Weight ◽

Life Span ◽

Post Partum ◽

Young Female ◽

Brushtail Possum ◽

Lactation Period ◽

In Captivity ◽

In The Wild ◽

The Mean ◽

Reproductive Capability

The brushtail possum is a common arboreal marsupial that is well adapted to the Australian urban environment and to rearing in captivity. Data obtained from 100 female possums housed in a semi-captive colony over a 7 year period demonstrate the reproductive capability of this marsupial. The main breeding season is from March to June with a declining number of births occurring from July to October. The possums gave birth to 259 single young and one set of twins. The range of the lactation period was from 177 to 200 days with the birth of the subsequent young occurring at 188.4 ± 4.1 days post partum (SD, n = 5). The growth rate of the young female possum varied greatly after day 100 post partum, the mean body weight of possums at day 172, being 753.0 ± 76.2g (SD, n = 5) with a range of 685 to 851 g. Female possums, with a mean body weight of 2171 ± 388g, gave birth to their first litter on day 345.9 ± 69.3 days postpartum (mean, SD, n = 7). Although two female possums trapped in the wild were held in captivity for 64 and 63.4 months and one possum bred in captivity had a life span of 51.5 months, the mean life span was 21.0 ± 12.5 months (SD, n =3D 8), with a range of 14.3 to 51.5 months. This life span is very variable and it is of interest to determine if this is an artefact of captivity or is also observed in the wild.

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Application of Non-linear Growth Curve Models to Body Weight in Egg-type Chicken.

Japanese poultry science ◽

10.2141/jpsa.32.394 ◽

1995 ◽

Vol 32 (6) ◽

pp. 394-401 ◽

Cited By ~ 1

Author(s):

Shunzo MIYOSHI ◽

Mitsuyoshi SUZUKI ◽

Takatsugu MITSUMOTO

Keyword(s):

Body Weight ◽

Growth Curve ◽

Linear Growth ◽

Growth Curve Models ◽

Non Linear ◽

Linear Growth Curve

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Growth curve of Repartida goats reared in the Caatinga region, Brazil

Semina Ciências Agrárias ◽

10.5433/1679-0359.2017v38n2p1041 ◽

2017 ◽

Vol 38 (2) ◽

pp. 1041 ◽

Cited By ~ 2

Author(s):

Luanna Chácara Pires ◽

Théa Mírian Medeiros Machado ◽

Paulo Luiz Souza Carneiro ◽

João Batista Lopes da Silva ◽

Andréa Duarte de Holanda Barbosa ◽

...

Keyword(s):

Growth Rate ◽

Body Weight ◽

Growth Curve ◽

Maximum Growth ◽

Maximum Growth Rate ◽

Lower Probability ◽

High Birth Weight ◽

Average Growth ◽

Nutritional Deficit ◽

Weight Data

This work aimed to determine which non-linear model (Brody, Gompertz, logistic, von Bertalanffy or Richards) best represents the average growth curve of goats, in addition to evaluating the effect of the environment. The weight data of 40 Repartida goats reared in the Brazil Caatinga were included in this study. Weight data was collected every 30 days from birth until 270 days of age. The parameters of the models (A, mature body weight; B, constant of integration; k, maturation rate; m, inflection point) were estimated using the NLIN procedure of SAS. The logistic model showed a slightly higher average fit in comparison to the other models. The absolute growth rate suggests that the maximum growth rate was reached early. The effect of the contemporary groups was significant (P < 0.05), but only for the estimated k parameter. The estimated correlation between the A and k parameters was significant and negative, indicating a lower probability of a high body weight in adulthood. Goats of the Repartida ecotype are characterized by their high birth weight and low weight at maturity, which combined with the nutritional deficit, suggests that these animals have adapted to the adverse conditions of the Brazilian Caatinga region.

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Rearing cynomolgus monkeys (Macaca jascicularis) on surrogate mothers with bottle feeding

Laboratory Animals ◽

10.1258/002367788780746476 ◽

1988 ◽

Vol 22 (3) ◽

pp. 229-234 ◽

Cited By ~ 9

Author(s):

P. J. A. Timmermans ◽

E. L. Röder ◽

A. M. L. J. Kemps

Keyword(s):

Body Weight ◽

Sex Differences ◽

Individual Differences ◽

Standard Deviation ◽

Growth Curve ◽

Peer Groups ◽

Bottle Feeding ◽

Surrogate Mothers ◽

Cynomolgus Monkeys ◽

The Mean

Fifty-two cynomolgus monkeys were reared in peer groups on surrogate mothers and fed by bottle during the first months of life. A description of the technique of bottle feeding and the structure of surrogate mothers is presented. Results are shown in a growth curve. Inter-individual differences in body weight were very large. The mean weight was higher in males than in females, but no significant sex differences in growth occurred. The weight of mother-reared infants stayed within the standard deviation of the mean weight of the artificially-reared subjects.

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Growth modeling of dairy heifers in Québec based on random regression

Canadian Journal of Animal Science ◽

10.4141/cjas2011-083 ◽

2012 ◽

Vol 92 (1) ◽

pp. 33-47 ◽

Cited By ~ 9

Author(s):

R. I. Cue ◽

D. Pietersma ◽

D. Lefebvre ◽

R. Lacroix ◽

K. Wade ◽

...

Keyword(s):

Body Weight ◽

Growth Curve ◽

Growth Modeling ◽

The Body ◽

Random Regression ◽

Individual Growth ◽

Residual Variance ◽

Brown Swiss ◽

Dairy Heifers ◽

Height Data

Cue, R. I., Pietersma, D., Lefebvre, D., Lacroix, R., Wade, K., Pellerin, D., de Passillé, A-M. and Rushen, J. 2012. Growth modeling of dairy heifers in Québec based on random regression. Can. J. Anim. Sci. 92: 33–47. A total of 144 006 weight (calculated from tape girth measurements) and height data records from Québec dairy heifers were analyzed using random regression to estimate growth curve parameters of Ayrshires, Brown Swiss and Holstein animals to permit prediction of individual heifer growth from 0 to 32 mo. There were, on average, 5.15 records per heifer (minimum 3 records, maximum 25 records). The body weight data were analyzed using linear and quadratic fixed and random regressions, with a power-of-the-mean (POM) function to model the residual variance. The POM was 1.2 for Holstein and Ayrshire and slightly less than 1 for Brown Swiss. Estimated body weight at 24 mo was 507, 564, 624 kg, for Ayrshires, Brown Swiss and Holstein, respectively. The height data were analyzed with a Brody, monomolecular non-linear growth curve model. Mature height was estimated to be 148 cm in both Holstein and Ayrshires, and 150 cm in Brown Swiss. Random regression models were shown to be able to predict individual growth, and can be incorporated in decision-support tools to help producers reducing the average age at first calving.

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Karakteristik reproduksi ikan sidat Anguilla bicolor McClelland, 1844 yang diinduksi GNRH-analog

Jurnal Iktiologi Indonesia ◽

10.32491/jii.v17i2.355 ◽

2018 ◽

Vol 17 (2) ◽

pp. 155

Author(s):

Farida Nur Rachmawati ◽

Untung Susilo ◽

Muslih Muslih

Keyword(s):

Body Weight ◽

Average Weight ◽

Gnrh Analog ◽

Gnrh Analogues ◽

Gonadal Maturation ◽

In Captivity ◽

Ad Libitum ◽

Estradiol Levels ◽

Different Doses ◽

Tropical Eel

Eel, Anguilla bicolor McClelland was hard to mature in captivity, due to low levels of pituitary gonadotropin. In order to stimulate gonadal maturation in captivity, exogenous gonadotropin is needed. The purpose of this study was to assess the effect of GnRH-analog induction on gonadal maturation of tropical eel base on the value of the eye index, gonado-somatic index, and estradiol levels. The study was carried out experimentally with a completely randomized design with three treatments and eight replications. The treatments were the induction of hormone GnRH-analogues with doses of 0.0; 0.5 and 1.0 ml kg-1 body weight. Eel with an average total length of 67 cm and an average weight of 500 g were injected with different doses of GnRH-analog (0.0; 0.5 and 1.0 ml kg-1 body weight), kept in the fiberglass aquarium for two months. The eels were fed with discard fish daily in ad libitum at 16.00 pm. The observed variables were eye index, Gonadosomatic Index (GSI), and estradiol levels. The results showed that injection of three different doses of GnRH-analog did not affect on the increasing of GSI, eye index (P> 0.05), and estradiol (P <0.05). Induction of GnRH-analog of 0.0; 0.5 and 1.0 ml kg-1 body weight can not stimulate the gonadal maturity of tropical eel. AbstrakIkan sidat Anguilla bicolor McClelland sulit matang gonad dalam kondisi budi daya, karena rendahnya kadar gonado-tropin pituitari. Oleh karena itu untuk memacu pematangan gonad ikan sidat dalam kondisi budi daya perlu ditambah-kan gonadotropin secara eksogen. Tujuan penelitian ini adalah mengkaji pengaruh induksi GnRH-analog terhadap pe-matangan gonad ikan sidat berdasarkan perubahan nilai indeks mata, indeks kematangan gonad (IKG), dan kadar estradiol. Penelitian dilakukan secara eksperimental menggunakan rancangan acak lengkap dengan tiga perlakuan dan delapan ulangan. Perlakuan percobaan terdiri atas induksi hormon GnRH-analog dengan dosis 0,0; 0,5 dan 1,0 ml kg-1 bobot badan. Ikan sidat dengan rata-rata ukuran panjang 67 cm dan rata-rata bobot 500 g sebanyak 18 ekor yang telah diinduksi dengan berbagai dosis GnRH analog (0, 0,5 dan 1 ml kg-1 bobot badan) dipelihara dalam akuarium fiberglass selama dua bulan. Pakan berupa ikan rucah diberikan satu kali sehari pada pukul 16.00 secara ad libitum. Variabel yang diamati adalah indeks mata, IKG, dan kadar estradiol. Hasil penelitian menunjukkan bahwa induksi hormon GnRH-analog tidak berpengaruh terhadap peningkatan nilai indeks mata, nilai IKG (p>0,05), dan kadar estradiol ikan sidat (p<0,05). Induksi hormon GnRH-analog dengan dosis 0,5 dan 1 ml kg-1 bobot badan tidak efektif memacu pematangan gonad ikan sidat.

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Breast meat quality of chickens with divergent growth rates and its relation to growth curve parameters

Archives Animal Breeding ◽

10.5194/aab-60-427-2017 ◽

2017 ◽

Vol 60 (4) ◽

pp. 427-437 ◽

Cited By ~ 5

Author(s):

Philipp C. Muth ◽

Anne Valle Zárate

Keyword(s):

Growth Rate ◽

Body Weight ◽

Meat Quality ◽

Growth Curve ◽

Growth Rates ◽

Cooking Loss ◽

Growth Potential ◽

Breast Meat ◽

Fast Growing ◽

Slow Growing

Abstract. The effects of the increase of body weight of contemporary broilers during growth on functional meat quality and color characteristics of the chicken breast muscle are controversially debated. Therefore, male chickens (n = 264) of a fast-growing commercial broiler (Ross 308) and two slow-growing experimental meat-type chicken lines were compared at equal age and at similar body weight in order to investigate the effect of growth rate on selected functional breast meat traits and meat color. Additionally, the breast meat characteristics of birds with different growth profiles were compared within lines. When the body weight of commercial broilers reached about 40 to 60 % of their growth potential, they exhibited particularly high ultimate pH values compared with slow-growing lines. The ability of the meat of fast-growing broilers to retain water during cooking was impaired (5 to 16 percentage points increased cooking loss compared to slow-growing lines), which, in contrast to pH, was only marginally affected by body weight and/or age at slaughter. No unfavorable correlations of breast meat quality traits with the growth profile, represented by growth curve parameters derived from the Gompertz–Laird equation, were detected within any of the investigated chicken lines. It is noteworthy that the associations of ultimate pH and cooking loss with maximum growth speed indicate a non-linear relationship. Thus, some of the functional characteristics of breast meat of the fast-growing broiler resembled the white-striping defect described for poultry meat, but the hypothesis that selection on increased growth rates is detrimental for meat quality per se could not be confirmed. In fact, an elevated growth potential in particular, i.e., body weight at maturity, could have some beneficial effects for the water-holding capacity of breast meat, regardless of the genotypic growth rate.

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Modeling the Growth of Four Commercial Broiler Genotypes Reared in the Tropics

10.21203/rs.3.rs-985098/v1 ◽

2021 ◽

Author(s):

Bernard Ato Hagan ◽

Christian Asumah ◽

Ernest Darkwah Yeboah ◽

Vida Korkor Lamptey

Keyword(s):

Body Weight ◽

Growth Curve ◽

Polynomial Growth ◽

Gompertz Function ◽

Final Body Weight ◽

Growth Functions ◽

Broiler Production ◽

Commercial Broiler ◽

The Tropics ◽

Late Growth

Abstract Genetic improvement in commercial broilers worldwide is heavily focused on selection for higher final body weight at a given age. Although commercial broilers are mostly sold by their final body weight, it is important to pay attention to how this weight is attained and at what cost. The cost of feeding broilers, which constitutes about 70% of the total cost of broiler production, varies considerably at different stages of the bird. It is, therefore, important to pay attention to the growth curve of broilers and the parameters of the growth curve to maximise profitability of commercial broiler production. The objective of this study was to model the variations of the growth curves of 4 commercial broiler genotypes reared in Ghana using the Gompertz and polynomial growth functions. Data on body weights at 1, 7, 14, 21, 28, 35 and 42 days for 4 unsexed commercial broiler genotypes were used to model both the Gompertz and polynomial growth functions. The 4 genotypes ranked differently for Gompertz predicted early (1 - 28 days), late growth (28 – 42 days) and body weight at 42 days. Gompertz function predicted growth better for broiler chicken than the polynomial as the parameters of the Gompertz function are biologically meaningful and heritable. Selection of broiler genotypes for production based on their growth curve (slower early growth and faster late growth) could minimize cost of production and thereby increase the profitability of commercial broiler production in the tropics.

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