Reproductive performance in purebred and crossbred commercial rabbits

1981 ◽  
Vol 32 (3) ◽  
pp. 325-331 ◽  
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.

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

1988 ◽  
Vol 68 (1) ◽  
pp. 69-81 ◽  
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

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

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

<p>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(<em>P</em>&gt;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 (<em>P</em>&gt;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 (<em>P</em>&lt;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.</p>

The litter size and fertility of Finnish Landrace and Tasmanian Merino sheep and their reciprocal crosses

1974 ◽  
Vol 18 (3) ◽  
pp. 265-271 ◽  
Author(s):  
R. B. Land ◽  
W. S. Russell ◽  
H. P. Donald
Keyword(s):  
Litter Size ◽  
Direct Effect ◽  
Adult Female ◽  
Reproductive Performance ◽  
Conception Rate ◽  
Mating Period ◽  
Reciprocal Crosses ◽  
Merino Sheep ◽  
Size Number

SUMMARYLitter size (number of lambs born per female lambing) of adult female Finnish Landrace and Tasmanian Merino sheep mated to males of either breed was 2·9 and 1·0 respectively. Breed of ram had a direct effect on the conception rate of the ewes to which they were mated—22% of ewes mated to Merino rams returned to oestrus but only 10% of those mated to Finn rams—but not on their litter size.A comparison of the reproductive performance of crossbred females with that of purebred contemporaries indicated that there was very little or no heterosis for litter size, the crossbreds being almost exactly intermediate between the parents. The proportion of females showing oestrus during the mating period, however, was lower in the Merinos than in the Finns and crossbreds. This was particularly noticeable in females put to the ram at around 6 months of age. Whereas 35 of 36 Finnish Landrace females and 46 of 49 crossbreds showed oestrus, only one of the 20 Merinos did so. At about 6 months of age therefore the crossbred females showed heterosis in the incidence of oestrus.

scholarly journals Effect of re-mating intervals on growth and reproductive performance of rabbits

2013 ◽  
Vol 42 (2) ◽  
pp. 143-147
Author(s):  
BK Saha ◽  
MB Sarker ◽  
MH Alam ◽  
ME Kabir ◽  
MR Amin ◽  
...  
Keyword(s):  
Growth Rate ◽  
New Zealand ◽  
Litter Size ◽  
Milk Yield ◽  
Reproductive Performance ◽  
Gestation Length ◽  
Natural Lighting ◽  
Litter Weight ◽  
Nest Boxes ◽  
Size At Birth

The aim of this study was to know the effects of postpartum re-mating intervals on reproductive performances of does and growth of kits. Fifteen female New Zealand White crossbred rabbits were divided into three groups of equal numbers. They were re-mated within 24 hours, at 10 days and 28 days postpartum. Animals were individually caged in cells measuring 2'×2'×2'. Does were kept under natural lighting. Plastic nest boxes were supplied to does 3-4 days before parturition. They were reared up to four generation. Litter weight at birth was significantly (p<0.05) higher at 10 days postpartum than within 24 hours and at 28 days postpartum intervals. Higher growth rate was observed in 10 days postpartum group comparing to other re-mating groups. Milk yield of the dams were significantly (p<0.05) higher when dam re-mated at 10 days postpartum than those re-mated within 24 hours after parturition. Conception rate, gestation length of does, litter size at birth and weaning, litter weight at weaning, doe weight at mating, kidding, weaning and kid mortality did not differ significantly among the groups. Rabbit does re-mated at 10 days postpartum show maximum litter weight at birth, growth rate of kits and milk yield of dam.DOI: http://dx.doi.org/10.3329/bjas.v42i2.18497 Bang. J. Anim. Sci. 2013. 42 (2): 143-147

scholarly journals EVALUASI REPRODUKSI INDUK KELINCI NEW ZEALAND PADA BERBAGAI PARITAS (Studi Kasus di UD. Alastika Jaya Desa Tulungrejo Kecamatan Gandusari Kabupaten Blitar)

2021 ◽  
Vol 13 (1) ◽  
pp. 23-28
Author(s):  
Iva Mardiani Fatimah ◽  
Nita Opi Ari kustanti ◽  
Edya Moelia Moeis
Keyword(s):  
Data Analysis ◽  
New Zealand ◽  
Litter Size ◽  
Research Method ◽  
Field Survey ◽  
Secondary Data ◽  
Average Value ◽  
Days Open ◽  
Size At Birth

The aim of this study is to find out reproctive performance of New Zealand doe in UD. Alastika Jaya. This study use 35 of 51 doe population as the sample and field survey to take primary and secondary data from observation and interview as the research method.  The result of observation and data analysis of study indicate that average value of service per conception (S/C), long of days open, gap of bred after whelped, interval of birth, litter size at birth, and litter size at weaning in a row is 2,17+0,57, 33,33+16,56 days, 32,6+22,14 days, 65,67+16,54 days, 6,65+2,54 kits, dan 4,24+2,05 kits

A note on the effect of white-flowered peas on sow reproductive performance

1993 ◽  
Vol 56 (1) ◽  
pp. 155-158
Author(s):  
R. B. Ogle ◽  
K. Annér
Keyword(s):  
Litter Size ◽  
Reproductive Performance ◽  
Live Weight ◽  
Soya Bean ◽  
Weight Gains ◽  
Bean Meal ◽  
Piglet Mortality ◽  
Natal Mortality ◽  
Soya Bean Meal ◽  
Size At Birth

The effect on sow reproductive performance of including 100 g white-flowered peas (Pisum sativum hortense, cv. Vreta and Lotta) per kg, replacing barley, wheat and soya-bean meal in gestation and lactation diets, was studied over four parities using 24 pairs of crossbred littermate sows. Net sow weight gains and changes in backfat thickness over the complete reproductive cycle were similar for both treatments. Piglet live-weight gains and mean litter size at birth were not influenced by treatment, although litter size at weaning was 0·5 pigs higher (P > 0·05) for the control sows, due to higher post-natal mortality rate in the litters from the sows given the pea diets. It can be concluded that inclusion of white-flowered peas at a rate of 100 g/kg had no adverse effect on reproductive performance, with the exception of slightly higher post-natal piglet mortality.

MASS SELECTION IN A PIG POPULATION. 2. THE EFFECTS OF INBREEDING WITHIN THE SELECTED POPULATIONS

1977 ◽  
Vol 57 (4) ◽  
pp. 627-634 ◽  
Author(s):  
HITOSHI MIKAMI ◽  
H. T. FREDEEN ◽  
A. P. SATHER
Keyword(s):  
Litter Size ◽  
Reproductive Performance ◽  
Degrees Of Freedom ◽  
Regression Coefficients ◽  
Longissimus Dorsi ◽  
Mass Selection ◽  
Cross Sectional ◽  
Litter Weight ◽  
Daily Gain ◽  
Size At Birth

The regression of reproductive performance of dams and post-natal performance of progeny on inbreeding was examined for a population of replicated lines subjected to mass selection over a period of nine generations. Inbreeding advanced by 2.0–2.3% per generation. Regression coefficients per 1% increase in inbreeding, based on 817 degrees of freedom for first parity sows, were −.56 ±.23 kg for dam weight at first parturition (12 mo), −.48 ±.19 kg for dam weight change from parturition to weaning, −.013 ±.034 for litter size at birth, −.103 ±.033 for litter size at weaning and −1.36 ±.36 kg for litter weight at weaning. Regressions for post-natal traits, estimated for progeny produced by second parity dams during the final three generations (638 df) were 10.3 ± 4.0 g for birth weight, 16.8 ± 32.7 g for weaned weight, −4.53 ± 1.22 g for post-weaning daily gain, −.34 ±.16 mm for backfat,.10 ±.04 cm2 for cross-sectional area of the longissimus dorsi, and.09 ±.04% for estimated yield of trimmed retail product from the carcass.

scholarly journals Performance characteristics of sows fed enriched diet from weaning to service in a commercial flock

2021 ◽  
Vol 36 (1) ◽  
pp. 12-19
Author(s):  
A. M. Orcheruata ◽  
A. T. Sphine ◽  
S. O. Nwokoro
Keyword(s):  
Litter Size ◽  
Mean Value ◽  
Performance Characteristics ◽  
Small Litter ◽  
Commercial Flock ◽  
Reproductive Life ◽  
Weaning Age ◽  
Production Indices ◽  
Farrowing Rate ◽  
Size At Birth

Fielded data from 40 sows together with obtained data from 1999 to 2005 we analysed to determine the performance of sows fed enriched diet from weaning to a service in a commercialflock. The data were on litter size at birth (LTZVT), litter size at weaning (LTZWN), weaning age (WNAGE) forrowing interval (FRINT), purity (PRTY) and reproductive life (PRODLF).  Mean value of 9.44(no), 6.04(no), 31.874, 453.58d and 3.65yrs were obtained for LTZBT, LTZWN, WNAGE, FRINT and PRODLF respectively. The influence of parity on sow's performance was analyzed while mortality and sows efficiency of production were determined. Anagonistic relationship existed between production and reproduction traite. Mortality amongst piglets increased with weaning age. Over 80% of sows hold PRINT of less than 157 days, farrowed litters greater than 7 and 55% weaned litter size of over 8. Parity had no influence on sow's performancw. Sow efficiency of production indices showed that sows had 2 farrowing/year, a farrowing rate of 84% and small litter index of less than 17%. The findings of this study have indicated that better performance of sows can be achieved by giving enriched diet (flushing) from weaning to a service rather than the practice of flushing only few days to service

scholarly journals Effect of body weight at first mating on reproductive performance of rabbit does

2020 ◽  
Vol 46 (5) ◽  
Author(s):  
O. Y. Ayo-Ajasa ◽  
L.T. Egbeyale ◽  
F. A. Adewole ◽  
D. A. Ekunseitan ◽  
O. A. Babalola
Keyword(s):  
Body Weight ◽  
Litter Size ◽  
Reproductive Performance ◽  
Reproductive Parameters ◽  
Initial Body Weight ◽  
Average Birth Weight ◽  
Statistical Representation ◽  
T1 And T2 ◽  
Breeding Efficiency ◽  
Size At Birth

Eighteen mature nulliparous rabbit does with initial body weight between 1600g-2500g were used to evaluate the effect of body weight at first mating on reproductive performance of rabbit does. These rabbits were assigned into three treatments, with T1, T2 and T3 weighing (1600-1900), (1901-2200) and (2201-2500) respectively. The study lasted for 5weeks. The does were mated with buck at ratio 1:3. The reproductive parameters evaluated were number of does that kindled, litter size at birth, breeding efficiency, litter size at weaning, pre-weaning loss. All data collected were subjected to descriptive statistical representation. The highest number of kindled does was 5 in T2 and T3; T1 had the lowest number (3). Breeding efficiency of 83.33% was recorded in T1 and T2 while T3 had 50.00%. T3 had highest average birth weight (49.51g) and T2 had the least (41.51g); litter size at birth and weaning ranged from 18 -28kits and 15-24kits, respectively. T2 does recorded highest value in both parameters, T3 does recorded same value (28kits) for litter size at birth. Highest pre-weaning loss of 7kits was recorded from does in T3 while T1 and T2 recorded 4kits. It was therefore concluded that does with weight range 1901g – 2200g had better reproductive performance with highest breeding efficiency and lower pre-weaning loss.

scholarly journals Sperm concentration on the intrauterine artificial insemination in swine

2009 ◽  
Vol 33 (6) ◽  
pp. 1671-1674
Author(s):  
Joana Miller ◽  
Ana Luísa Neves Alvarenga ◽  
Luis David Solis Murgas ◽  
Adriana Cristina da Silva ◽  
Ricardo Sales Araújo ◽  
...  
Keyword(s):  
Litter Size ◽  
Reproductive Performance ◽  
Artificial Insemination ◽  
Intrauterine Insemination ◽  
Sperm Concentration ◽  
Conception Rate ◽  
Cervical Canal ◽  
Significant Difference ◽  
Estrus Detection ◽  
Farrowing Rate

The aim of this work was to evaluate the efficiency of the intrauterine insemination (IUI) in swine, considering the conception rate, farrowing rate, litter size (alive born pigs). For the IUI, the females had been insemination at 24 and 48 hours after the estrus detection, and the inseminating doses of 500 million, 1 billion, 1.5 billion and 2 billion spermatozoa in 20 mL extender had been used. The procedure of catheter insertion through the cervical canal was successfully performed in 97.9% of the females. The conception rate was 6.3% in the IUI. The farrowing rate in IUI was 87.2% but the farrowing rate was 100% for the sperm concentration of 500 million. Regarding the number of born pigs and alive born pigs observed in females inseminated with IUI, no significant difference was observed (p > 0.05). The concentration of 500 x 10(6) spermatozoa in 20 mL extender in the intrauterine insemination resulted in an optimal reproductive performance.

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