PRODUCTIVITY TRAITS OF LOCAL MOUNTAIN GOAT AND SOME FACTORS AFFECTING THEM

The aim of the current investigation was to evaluate some reproductive aspects of local mountain goat raised in farm conditions. A total number of 498 does were mated during two successive years. Results revealed that fertility, conception, kidding, productivity and twinning rates averaged 80.72, 87.15, 84.94, 72.29 and 5.22 %, respectively. Litter size at birth and weaning were 1.05 and 0.9 respectively. Also, all above traits were significantly lower in does aged 2.5 years as compared with older does except those of litter size at birth and weaning. Effect of year of mating was found to be significant only on conception rate. Does mated in August resulted in a significant increase in the studied traits compared with that mated in September and October except those in twinning rate, litter size at birth and weaning. The regressions of litter size at birth and twinning rate on dam’s body weights were significant.

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THE ACCUMULATIVE EFFECT OF FINNSHEEP BREEDING IN CROSSBREEDING SCHEMES: REPRODUCTIVE PERFORMANCE

Canadian Journal of Animal Science ◽

10.4141/cjas88-007 ◽

1988 ◽

Vol 68 (1) ◽

pp. 69-81 ◽

Cited By ~ 6

Author(s):

MOHAMED H. FAHMY ◽

JACQUES J. DUFOUR

Keyword(s):

Body Weight ◽

Mortality Rate ◽

Key Words ◽

Litter Size ◽

Reproductive Performance ◽

Conception Rate ◽

Ovulation Rate ◽

Genetic Groups ◽

Linear Regressions ◽

Size At Birth

Reproductive performance and body weight were studied on 361 ewes, representing Finnsheep (F), DLS (a population of 1/2 Dorset, 1/4 Leicester, 1/4 Suffolk) and seven combinations ranging from 1/8 to 7/8 Finnsheep breeding. Conception rate in yearlings was 61.5% for DLS compared to 89.0% for F with the crosses being intermediate. Conception rate in older ewes was similar in the different genetic groups (avg. 94%). Ovulation rate and litter size at birth of DLS ewes were 1.72 and 1.44 lambs, which was less than half those of F ewes (3.51 and 2.86 lambs, respectively). Both traits increased progressively with an increase in F breeding in crosses and with advances in age. DLS ewes weaned 1.22 lambs compared to 2.03 lambs for F ewes and 1.84 lambs for 4/8 F ewes. The heaviest litters at weaning (31.7 kg) were raised by 4/8 F ewes, followed by 7/8 F (30.8 kg) while those raised by DLS ewes weighed 23.0 kg and F ewes 29.1 kg. Percentage of ova lost per ewe mated averaged 24% and ranged between 18% (DLS and 1/8 F) and 29% (6/8 F). About 3.6% of lambs were born dead and a further 13.8% died before weaning. Preweaning mortality rate was highest in F (22.9%) and lowest in 3/8 F (9.4%). Average kilograms of lambs weaned per ewe exposed was highest in 4/8 F (27.6 kg) followed by F (26.0 kg), whereas that of DLS was the lowest at 18.1 kg. The 4/8 F cross showed 25% heterosis in kg of lambs weaned per ewe exposed and 52.5% increase over DLS. Significant positive linear regressions were calculated for ovulation rate, litter size and preweaning mortality rate on proportion of Finnsheep breeding in crosses. The relation was quadratic for percent ova lost and lamb mortality at weaning. Yearling DLS females weighted 36 kg compared to 44 kg for F yearlings. However, at 5 yr of age DLS ewes weighed 62 kg, 5 kg heavier than F ewes. The heaviest ewes at all ages were the 4/8 F (45 kg at 1 yr, 65 kg at 5 yr). Key words: Reproduction, DLS sheep, Finnsheep, crossbreeding, heterosis, repeatabilities

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Performance evaluation of Soviet Chinchilla and Californian White rabbit breeds in tropical climatic conditions of India

Indian Journal of Animal Research ◽

10.18805/ijar.v0iof.7605 ◽

2017 ◽

Author(s):

Uday Kannegundla ◽

S. Sai Reddy ◽

M. Gnana Prakash ◽

M. Mahenderand ◽

P. Amareswari

Keyword(s):

Least Squares ◽

Litter Size ◽

Climatic Conditions ◽

Research Station ◽

Productive Performance ◽

Litter Weight ◽

Body Weights ◽

Genetic And Phenotypic Correlations ◽

High Heritability ◽

Size At Birth

Study was conducted to evaluate the performance of Soviet Chinchilla and Californian White rabbit breeds maintained in tropical environment at rabbit research station, Hyderabad, Telangana. Data generated on total of 1364 bunnies, 701 belongings to the Soviet Chinchilla born in 122 litters and 663 bunnies of Californian White born in 124 litters during the period from 2012 to 2015 were utilized to examine the various productive performance traits. The overall least-squares mean litter size and litter weight was 5.52 ± 0.16 and 264.75 ± 7.86 at birth and 3.56 ± 0.17 and 1439.67 ± 72.55 g at weaning, respectively. The overall least-squares mean pre weaning body weights were 48.39 ± 0.48, 113.65 ± 1.38, 161.50 ± 2.03, 226.15 ± 3.47, 417.89 ± 7.53g at birth, 1, 2, 3 and 4 weeks of age and the post weaning weights at 6, 8, 10, 12, 14 and 16 weeks of age were 628.75 ± 13.02, 844.11 ± 14.81, 1040.79 ± 16.42, 1225.96 ± 17.81, 1437.57 ± 20.54 and 1636.99 ± 28.87 g, respectively. Season of birth and litter size at birth showed significant (£0.01) effect on body weights while genetic group, parity of the doe and sex of the bunny had slight effects only. The low to high heritability estimates, genetic and phenotypic correlations of body weights are the indication for improvement of body weights by appropriate breeding plans.

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Effect of body weight on the attainment of puberty and reproductive performance of Galway and Fingalway female lambs

Animal Science ◽

10.1017/s0003356100023217 ◽

1979 ◽

Vol 28 (3) ◽

pp. 297-307 ◽

Cited By ~ 16

Author(s):

J. F. Quirke

Keyword(s):

Body Weight ◽

Breeding Season ◽

Litter Size ◽

Conception Rate ◽

Restricted Feeding ◽

Ewe Lambs ◽

Younger Age ◽

Body Weights ◽

The Mean ◽

Ad Libitum

ABSTRACTGroups of spring-born Galway (G) and Fingalway (F) ewe lambs were fed a concentrate diet either ad libitum (H) or at a restricted level (L) during the period 25 July to 16 October 1974 in order to induce differences in body weight at the start of the breeding season. The mean live weights of the GL, GH, FL and FH groups on 16 October 1974 were 37·8 ± 1·3, 44·6 ± 1·3, 35·1 ± 1·1 and 41·9 ± 1·2 kg respectively. More than 95% of the lambs in all four groups attained puberty before 28 February 1975. Galway ewe lambs reached puberty later in the breeding season and were older and heavier at puberty than Fingalways. Animals fed ad libitum were heavier at puberty and attained puberty earlier in the season and at a younger age than those on the restricted feeding regime.Both conception rate and litter size were lower in Galways than Fingalways. There was no evidence of any effect of the nutritional treatments on conception rate or litter size. The mean body weights at puberty for ewes which lambed and those which were barren were 41·9 ± 0·49 and 41·5 ± 0·78 kg respectively. The birth weight and growth rate of the progeny of the ewe lambs was similar for the two breeds and was not influenced by the previous nutritional treatment of the dams. The total lamb mortality between birth and weaning was 40·3%, and 72% of all deaths occurred within 48 h of birth. Losses among twins (48%) were particularly heavy.

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Descriptive characterization of a nigerian heterogeneous rabbit population - factors affecting litter traits.

World Rabbit Science ◽

10.4995/wrs.2010.18.14 ◽

2010 ◽

Vol 18 (2) ◽

pp. 111

Author(s):

S.O. Oseni ◽

B.A. Ajayi

Keyword(s):

Litter Size ◽

Reproductive Traits ◽

Daily Weight Gain ◽

Average Weight ◽

Font Size ◽

Factors Affecting ◽

Litter Traits ◽

Nigerian Population ◽

Size At Birth

Thi study evaluated the effect of female body weight at conception (FWC), season of mating (SM), type of mating (TM) and litter size at birth (LSB) on the litter performance in a heterogeneous Nigerian population of rabbits. Data on 116 litters from 10 bucks and 48 does across three parities were analysed. Reproductive traits evaluated included LSB, number born alive (NBA), litter sizes and weights at 7, 14 and 21 d post-kindling, pre-weaning survival rate (SR) and daily weight gain of kits from kindling to weaning (DWG). A fi xed linear model that included FWC (light and heavy does), TM (homospermic and heterospermic matings), LSB classes (low, medium and large) and SM (rainy or dry) was used. Results showed that heavier does at concenption showed higher performance for LSB and NBA (P<0.05) than lighter does. Average weight of kits at kindling and at 28 d, as well as kit SR and DWG, were signifi cantly higher in low-sized litters, when compared with intermediate- and large-sized litters (P<0.05). LSB, NBA and litter size at weaning were higher in litters produced by heterospermically mated does compared with homospermically mated does. Season of mating affected LSB and NBA (P<0.05), being signifi cantly larger the litters in the rainy season.

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Reproductive performance in purebred and crossbred commercial rabbits

Animal Science ◽

10.1017/s0003356100027227 ◽

1981 ◽

Vol 32 (3) ◽

pp. 325-331 ◽

Cited By ~ 13

Author(s):

G. G. Partridge ◽

S. Foley ◽

W. Corrigall

Keyword(s):

New Zealand ◽

Litter Size ◽

Reproductive Performance ◽

Conception Rate ◽

Annual Production ◽

Reciprocal Crosses ◽

Contributory Factors ◽

Weaning Age ◽

Size At Birth

ABSTRACTThe reproductive performance of does of New Zealand White (N) and Californian (C) strains of rabbit was compared with that of the two reciprocal crosses, C × N and N × C (sire × dam). Both types of crossbred doe showed a reproductive performance superior to the purebred strains, having both a higher conception rate and mean litter size at birth. C × N, N × C, N and C does reared on average 6·6, 7·4, 5·0 and 4·9 pups to weaning age respectively. Expressed in terms of an estimated annual production of weanlings the N × C does produced nearly twice as many progeny to 4 weeks of age as the purebreds N and C (37 pups cf. 21 and 19 pups respectively). Total losses prior to weaning were approximately 25% in all breeds, largely from stillbirths, and subsequent chilling and/or starvation in the nest (36% and 38% of diagnosed deaths respectively). Other contributory factors are discussed.

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Effect of lighting schedule, intensity, and colour on reproductive performance of rabbit does

World Rabbit Science ◽

10.4995/wrs.2021.14623 ◽

2021 ◽

Vol 29 (1) ◽

pp. 59

Author(s):

Yingjie Wu ◽

Ang Zhao ◽

Yinghe Qin

Keyword(s):

Litter Size ◽

Reproductive Performance ◽

White Light ◽

Artificial Insemination ◽

Red Light ◽

Conception Rate ◽

Reproductive Parameters ◽

Litter Weight ◽

Positive Effect ◽

Size At Birth

In order to establish a lighting regime suitable for rabbit farms in East China, the effects of lighting schedule, intensity and colour on the reproductive performance of rabbit does were evaluated by three experiments, respectively. In experiment 1, does were exposed to different lighting schedules: 16L:8D-continuous, 16L:8D-18d (6 d before artificial insemination (AI) to 12 d post-AI), 16L:8D-6d (6 d before AI to the day of AI) and 12L:12D-continuous. In experiment 2, does were exposed to different light intensities: 40 lx, 60 lx, 80 lx and 120 lx. In experiment 3, does were exposed to different light colours: white, yellow, blue and red. For all experiments, conception rate, kindling rate and pre-weaning mortality were calculated; litter size at birth, litter weight at birth, litter size at weaning, litter weight at weaning and individual kit weight at weaning were recorded. Results showed that none of the reproductive parameters of does were affected by the application of 16L:8D-18d lighting schedule compared with the continuous 16L:8D group(P>0.05). Moreover, rabbits does exposed to 80 lx light performed as well as those under 120 lx light in conception rate, kindling rate, litter size (total and alive) at birth and litter weight at birth (P>0.05). Furthermore, the exposures of 60 lx and 80 lx light were beneficial for litter weight at weaning. In addition, red light had a positive effect, as it led to a larger litter size and litter weight at weaning and lower pre-weaning mortality than white light (P<0.05). In summary, a 16L:8D photoperiod with 80 lx red light from 6 d before AI to 12 d post-AI is recommended for use in breeding of rabbit does according to our results.

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A genetic analysis of body weight traits in young Bauscat and Giza White rabbits

Animal Science ◽

10.1017/s0003356100036722 ◽

1987 ◽

Vol 45 (1) ◽

pp. 135-144 ◽

Cited By ~ 4

Author(s):

M. H. Khalil ◽

E. A. Afifi ◽

J. B. Owen

Keyword(s):

Body Weight ◽

Litter Size ◽

The Body ◽

Month Of Birth ◽

Components Of Variance ◽

High Magnitude ◽

Body Weights ◽

Genetic And Phenotypic Correlations ◽

Genetic And Environmental Factors ◽

Size At Birth

AbstractThe effects of various genetic and environmental factors on body-weight traits were studied in 3051 records of Bauscat (B) and Giza White (G) rabbits in the period from October 1976 to September 1983. Sixty-five sires and 289 dams were used for analysis of data of body weight at 6 weeks and bi-weekly up to 12 weeks of age. Year and month of birth exerted a pronounced effect on body weights of rabbits. Sex differences on the other hand were small at all ages studied and no pattern of parity effects was observed. Effects of litter size at birth were significant for 6-week weight but not for weights taken at later post-weaning ages. Body weights at the four ages studied decreased as litter size at weaning increased. Litter-weight effects on body weights decreased significantly as the age of the rabbit advanced. Sire and dam affected significantly most of the body-weight traits studied. The proportion of variance attributable to both sire and dam components for all body weights studied in G rabbits were generally larger than those in B rabbits. Heritabilities from sire and dam components of variance for body weights n i B rabbits were substantially lower than the corresponding estimates in G rabbits. Genetic and phenotypic correlations among body weights at all ages studied were positive and of moderate or high magnitude, and tended to decrease in value as the differences between the two ages increased.

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ESTIMATES OF PHENOTYPIC AND GENETIC CORRELATIONS IN WEST AFRICAN DWARF GOATS

Nigerian Journal of Animal Production ◽

10.51791/njap.v21i1.1096 ◽

2021 ◽

Vol 21 ◽

pp. 47-50

Author(s):

I. K. Odubute ◽

J. O. Akinokun

Keyword(s):

Body Weight ◽

Litter Size ◽

Genetic Correlations ◽

Correlation Coefficients ◽

West African ◽

West African Dwarf ◽

West African Dwarf Goat ◽

Body Weights ◽

Selection For ◽

Size At Birth

Records on 848 West African dwarf goat kids and 220 kiddings over a period of eight year's (1982-1989) were analyzed. The records were used to provide estimates of phenotypic and venetic correlations among parity, kidding interval, litter size at birth and body weight at various ages. Plenotypic correlation coefficients of +0.33 (P<0.01) and -0,17 (P<0.01) were obtained when parity was correlated with litter size at birth and kidding interval respectively. Phenotypic correlations among body weights were generally positive and significant (P<0.01). Parity was positively correlated (P<0.01) with body weight at the various ages except at 1 year (P>0.05). Litter size was, however, negatively correlated (P<0.01) with body weight at the various ages except at 1 year (P<0.05). The genetic correlations among body weights at variuus ages were positive and significant (P<0.01). Selection for body weight at in earlier age especially at 3 months is likely to result in improvement of yearling body weight.

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A note on the influence of routine induction of parturition by administration of a synthetic prostaglandin analogue on productivity in the rabbit

Animal Science ◽

10.1017/s0003356100004347 ◽

1989 ◽

Vol 49 (1) ◽

pp. 129-133 ◽

Cited By ~ 1

Author(s):

E. Ubilla ◽

J. M. Rodriguez

Keyword(s):

Litter Size ◽

Post Partum ◽

Conception Rate ◽

Sexual Receptivity ◽

Synthetic Analogue ◽

Prostaglandin Analogue ◽

Litter Weight ◽

The Individual ◽

And Control ◽

Size At Birth

The effect of routine induction of parturition on some reproductive and productive parameters during a year-long trial in 50 California doe rabbits allocated in two groups of 25 animals (treated and control), was studied. Intramuscular injections of 50 ug of the synthetic analogue of prostaglandin F2ct (Etiproston), were given at 10.00 h on day 29 of pregnancy. Control animals were untreated. When compared with the controls, treated does showed a significant reduction in the individual weight of pups at birth (49·7 (s.e. 0·41) and 52·2 (s.e. 0·53) g), number born dead per litter (0·42 (s.e. 0·11) and 0·81 (s.e. 0·16)), and parturition interval (42·9 (s.e. 1·5) and 53·5 (s.e. 1·7) days), and an increase in both sexual receptivity on days 6 to 9 post partum (70·4% and 43·0%), and in the conception rate to remating on days 6 to 7 post partum (82·2% and 66·6%), respectively. Litter size at birth, overall conception rate, mortality from birth to weaning, litter weight at 21 days, litter size at weaning, milk production, and mortality of does were not affected by the prostaglandin treatment.

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