Litter Size and Postnatal Growth Rate in the Pallid Bat, Antrozous pallidus

Two synthetic lines of rabbits were used in the experiment. Line V, selected on litter size, and line R, selected on growth rate. Ninety-six animals were randomly collected from 48 litters, taking a male and a female each time. Richards and Gompertz growth curves were fitted. Sexual dimorphism appeared in the line V but not in the R. Values for b and k were similar in all curves. Maximum growth rate took place in weeks 7 to 8. A break due to weaning could be observed in weeks 4 to 5. Although there is a remarkable similarity of the values of all the parameters using data from the first 20 weeks only, the higher standard errors on adult weight would make 30 weeks the preferable time to take data for live-weight growth curves.

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Evaluation of foetal growth, litter size and reproductive performance in rabbit after 18 generations of selection for growth rate using cryopreserved embryos

Livestock Science ◽

10.1016/j.livsci.2021.104702 ◽

2021 ◽

pp. 104702

Author(s):

J.D. Juarez ◽

F. Marco-Jiménez ◽

J.S. Vicente

Keyword(s):

Growth Rate ◽

Litter Size ◽

Reproductive Performance ◽

Foetal Growth ◽

Selection For ◽

Cryopreserved Embryos

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THE EFFECT OF THE DOE WEIGHT ON HER REPRODUCTIVE EFFICIENY

The Iraqi Journal of Veterinary Medicine ◽

10.30539/ijvm.v22i1.1203 ◽

2021 ◽

Vol 22 (1) ◽

pp. 131-142

Author(s):

Mohammad Ebrahim Ahmed ◽

Hussain Yawr Hussain

Keyword(s):

Growth Rate ◽

Litter Size ◽

Conception Rate ◽

The Other ◽

Gestation Period ◽

Reproductive Efficiency ◽

Litter Weight ◽

The Third ◽

Other Hand

Thirty-six local dose have been used and were divided in to three groups sacording to weight, in each group twelve dose. In the first group the weights of the dose were higher than ( 2.5 kgs) and less than (3 kgs). The second groups was higher than 3 kgs) and less than (3.5 kgs). The third group was higher than (3.5 kgs) and less than (4 kgs). The aim of this study was to obtain the effect of doe weight on her reproductive efficiency (gestation period, litter size, litter weight at birth and weaning, growth rate of offspring preweaning, conception rate and preweaning mortility). The weight of the doe had no significant effect upon the gestation period and this period was 30.9, 31.2, 31.3 days for the three groups respectively, on the other hand the litter size was affected significantly by doe weight and litter size was at birth and preaweaning (5.1 , 5.8 and 6.2), (4.5, 5.3 and 5.7) for the three groups respectively. The offspring weight at birth and weaning was affected significantly by doe weight and this weight was (40.1 , 48.2 and 53.3 gms), (203.6, 227.5 and 233.8 gms) for the three groups respectively while the conception rate was not affected by doe weight. The mortility percentage in the prewaning period was not significantly by doe weight

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Prenatal and postnatal growth: An ultrasound and clinical investigation

APOS Trends in Orthodontics ◽

10.4103/2321-1407.183150 ◽

2016 ◽

Vol 6 ◽

pp. 147-153

Author(s):

Shahista Parveen ◽

Rohan Mascarenhas ◽

Akhter Husain ◽

Devadas Acharya

Keyword(s):

Growth Rate ◽

Assessment Tool ◽

Clinical Investigation ◽

Normal Pregnancy ◽

Postnatal Growth ◽

Fetal Life ◽

Prenatal Growth ◽

Facial Development ◽

The Relationship ◽

Growth Assessment

Background Understanding facial development requires sound knowledge of growth at different stages. Although studies in the past have established the relationship between prenatal and postnatal growth, little research has been done using noninvasive ultrasound. The purpose of this study is to evaluate correlation between prenatal and postnatal growths using ultrasound as a fetal growth assessment tool. Study Settings: It is a hospital-based study where prenatal growth is measured at different intervals of gestational period and compared with the growth at birth. Materials and Methods: Ten subjects with normal pregnancy were studied using ultrasound. Cephalocaudal growth gradient, body proportions of the fetus were assessed and compared at different stages. Growth was also evaluated at birth and compared with the predicted growth. Results The growth rate of estimated fetal weight is at maximum between the 28th and 32nd week of the fetal life (P ≤ 0.001). The growth rate of head circumference, occipitofrontal diameter, and femur length is maximum between the 20th and 28th week of the fetal life (P < 0.001). Cephalocaudal growth gradient decreases with increased age of the fetus. Conclusions Prenatal growth is correlated with postnatal growth. Ultrasound can be used as a tool for the measurement and prediction of prenatal and postnatal growths.

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Comparison of carcass and meat characteristics of three rabbit lines selected for litter size or growth rate

Meat Science ◽

10.1016/j.meatsci.2006.03.007 ◽

2006 ◽

Vol 73 (4) ◽

pp. 645-650 ◽

Cited By ~ 35

Author(s):

P. Hernández ◽

B. Ariño ◽

A. Grimal ◽

A. Blasco

Keyword(s):

Growth Rate ◽

Litter Size

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Postnatal Growth Preceding Sudden Infant Death Syndrome

PEDIATRICS ◽

10.1542/peds.94.4.456 ◽

1994 ◽

Vol 94 (4) ◽

pp. 456-461

Author(s):

John G. Brooks ◽

Ruth E. Gilbert ◽

Peter J. Flemming ◽

Peter J. Berry ◽

Jean Golding

Keyword(s):

Growth Rate ◽

Sudden Infant Death Syndrome ◽

Infant Death ◽

Final Analysis ◽

Sudden Infant Death ◽

Postnatal Growth ◽

Bottle Feeding ◽

Sudden Infant ◽

Age At Death ◽

The Mean

Objective. To compare postnatal growth preceding the sudden infant death syndrome (SIDS) with that of age matched controls. Design. Retrospective case-control study. Each SIDS victim was matched with two controls on date of parental interview, postnatal age, and neighborhood. Clinical and demographic data were collected by parental interview and by review of medical records, and interval body weights were obtained from health visitors' records. Study population. All infants dying of SIDS between 1 May, 1987 and 30 April, 1989 in a geographically defined region consisting of four health districts in Avon and North Somerset in southwest England. Seventy-eight of the 99 SIDS victims and 139 of 156 control infants were included in the final analysis. Results. There was no significant difference between SIDS victims and the controls in either of the two indices of postnatal growth which were analyzed. The mean growth rates (± 1 SEM) between birth and the last live weight (age equivalent weight for control infants) were 27.1 ± 1.0 g/day for the SIDS cases and 28.3 ± 1.5 g/day for the control infants. The mean growth rate (± 1 SEM) between the last two live weights were 31.5 ± 2.9 and 24.9 ± 2.1 g/day for the SIDS and control infants, respectively. Stratification of the infants by sex, gestational age, maternal smoking during pregnancy, breast versus bottle feeding, or age at death, did not result in any significant differences between SIDS and controls in either of the indices of postnatal growth rate. The 20 SIDS cases which were excluded from the final analysis did not differ from 78 whose data was analyzed, with regard to established SIDS risk factors, age at death, or postmortem weight. Conclusions. No difference was found between the postnatal growth of SIDS victims and that of age matched control infants.

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Relations between piglet weights and survival

BSAP Occasional Publication ◽

10.1017/s0263967x00004250 ◽

1992 ◽

Vol 15 ◽

pp. 183-184 ◽

Cited By ~ 1

Author(s):

L. Rydhmer

Keyword(s):

Growth Rate ◽

Birth Weight ◽

Litter Size ◽

Important Influence ◽

Breeding Goal ◽

Litter Traits ◽

Size Number ◽

Piglet Survival

The birth weight of the piglet has an important influence on many aspects of later performance. There are, for example, relations between birth weight and growth rate as well as between birth weight and litter traits at farrowing (Rydhmer, Eliasson, Stern, Andersson and Einarsson, 1989). In a shorter perspective, birth weight affects piglet survival during the first weeks of life.High Utter size (number born) is a common breeding goal. Piglet weight is related to the number of piglets in the Utter. Piglet weight is also related to survival; thus mortality increases with litter size.The aim of this work was to study variation in piglet weight, some factors that may influence piglet weight and relations between litter size, piglet weight and piglet survival.Individual piglet weights were registered in 747 litters from an experimental farm. Of the 8134 piglets born, 2326 were Swedish Yorkshire, 239 Swedish Landrace, and the rest were crosses between these two breeds. One-third of the piglets were born in gilt litters. The piglets were creep fed from the 2nd week and weaned at 6 weeks of age. They were individually weighed at birth and at 3, 6 and 9 weeks of age. Birth weight in this report refers to the weight of all piglets born, including those stillborn.

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Physical and behavioral postnatal development of woodchucks (Marmota monax)

Canadian Journal of Zoology ◽

10.1139/z91-149 ◽

1991 ◽

Vol 69 (4) ◽

pp. 1040-1047 ◽

Cited By ~ 8

Author(s):

J. Ferron ◽

J.-P. Ouellet

Keyword(s):

Growth Rate ◽

Body Weight ◽

Social Behavior ◽

Postnatal Development ◽

Tail Length ◽

Postnatal Growth ◽

Behavioral Development ◽

Ground Squirrels ◽

Behavioral Repertoire ◽

Marmota Monax

The physical and behavioral postnatal development of woodchucks (Marmota monax) was analyzed from birth to 42 days of age, the age at which weaning begins. Postnatal growth was evaluated by means of daily measurements of body weight, body length, tail length, and length of hind foot. Data on length of ear pinnae, vibrissae, and fur, and on the timing of appearance of some events of physical development are also presented. We considered postnatal development of locomotion, alertness, exploratory behavior, feeding, and comfort and social behavior. Our results indicate no sexual dimorphism in body size in young woodchucks, despite its occurrence in adults. Intraspecific comparisons reveal that woodchucks from different populations show marked variation in growth rate. The high level of intraspecific variation in developmental rates of sciurid rodents provides a warning to those performing interspecific comparisons. The data also suggest that the ratio of growth rate to adult body weight is not related to environmental severity. Behavioral development in M. monax is similar to that of ground squirrels but faster than that of tree squirrels and flying squirrels. There is also no direct relationship between size and timing of behavioral development in sciurid rodents. The behavioral repertoire of young woodchucks is simpler than that of young Spermophilus lateralis, another asocial species. It is possible that specific differences in rates of development of social interactions led to such differentiation in the repertoire of social behavior.

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