scholarly journals Influence of Genotypes, Season of Birth, Parity Order and the Interactions between Them on Litter Traits and Body Weight Measurements of Rabbits

2021 ◽  
Vol 59 (3) ◽  
pp. 399-408
Author(s):  
alaa desouky
Keyword(s):  
Body Weight ◽  
Season Of Birth ◽  
Litter Traits ◽  
Birth Parity

GROWTH, PRODUCTION AND REPRODUCTION CHARACTERISTICS OF THE CANADIAN BREED OF CATTLE AND ITS FIRST CROSS AND BACKCROSS WITH THE BROWN SWISS. I. BODY WEIGHTS AND DIMENSIONS

1981 ◽  
Vol 61 (4) ◽  
pp. 853-860
Author(s):  
DOMINIQUE D. RONY ◽  
MOHAMED H. FAHMY ◽  
WILFRIED B. HOLTMANN
Keyword(s):  
Body Weight ◽  
Body Length ◽  
Season Of Birth ◽  
Body Dimensions ◽  
Brown Swiss ◽  
Body Weights ◽  
Growth Production

Body weight and seven body dimensions measuring the length, height, width and depth were taken at birth and every 180 days up to 720 days of age on 49 pure Canadian, 49 first cross of 1/2 Brown Swiss 1/2 Canadian, and 30 backcross of 1/4 Brown Swiss 3/4 Canadian heifers. The animals were raised up to 180 days of age at the Deschambault Station, then half the pure Canadian and the first cross were transferred to the La Pocatière Station. At birth, the pure Canadian calves weighed 29.2 kg and were lighter than the first and backcrosses by 6.9 kg (24%) and 4.8 kg (16%), respectively. The two crosses exceeded the pure Canadian in all the dimensions, the differences being significant in height at shoulder and width at rumps. At 360 days of age the two crosses were about 6% heavier and 4% higher at shoulder than the pure Canadian. With the exception of body length after 1 yr of age in which the backcross was slightly inferior to the pure Canadian, the two crosses were generally larger than the pure Canadian, with the backcross being intermediate between the first cross and the pure Canadian. The effects of season of birth and age of dam were found to be non-significant on most of the traits studied in this experiment.

Puberty in the Merino ewe with special reference to the influence of season of birth upon its occurrence

1961 ◽  
Vol 12 (1) ◽  
pp. 124 ◽  
Author(s):  
RH Watson ◽  
LC Gamble
Keyword(s):  
Body Weight ◽  
Special Reference ◽  
The Body ◽  
The Other ◽  
Gestation Period ◽  
Season Of Birth

Observations were made on the occurrence of mating and lambing in Merino ewes of three groups born in the spring, summer, and winter respectively. The lambs ware weaned at 13½–14½ weeks of age, and joined with rams within the following 2 weeks, some with fertile rams, others with vasectomized rams. Thereafter they ran with rams continuously or until lambing occurred. With few exceptions the first oestrus occurred between late November and May (summer and autumn), and the first conception between November and June. Of the ewes born in the spring, summer, and winter, 78, 100, and 95% respectively exhibited oestrus, and 63, 95, and 80% respectively conceived during the first spring, summer, and autumn following birth. All of the remainder experienced oestrus and all except one conceived during the same period in the following year. Both the age and the body weight of the ewes when oestrus and when conception first occurred varied widely. Both were least in the animals born in the spring and greatest in the animals born in the summer. The sexual season was shorter in the young ewes than it was in mature ewes. Further, the first sexual season of the youngest ewes at the time (those born in the spring) was only one-third of the length of the second sexual season or of the first sexual season of the ewes of the other two groups. There was little delay between the first opportunity to conceive and conception. However, among the ewes which mated youngest the proportion which lambed was lower than that in the other young ewes, which in turn was lower than in mature ewes. In addition, the gestation period in at least half of the ewes which lambed 3 youngest was substantially longer than it was in all except a very few of the other ewes

scholarly journals Effect of farm and birth season on calf body weight in the first week of life

2020 ◽  
Vol 36 (3) ◽  
pp. 297-307
Author(s):  
Ljiljana Samolovac ◽  
Milos Marinkovic ◽  
Maja Petricevic ◽  
Tamara Stamenic ◽  
Ivan Cosic ◽  
...  
Keyword(s):  
Body Weight ◽  
Production Process ◽  
The Body ◽  
Season Of Birth ◽  
Birth Season ◽  
Technological Production ◽  
Newborn Calves ◽  
On Farm ◽  
Average Body ◽  
Average Body Weight

The body weight of calves in the earliest period of their life (age from 0 to 7 days) is under the greatest influence of the farm and the season of birth. The farm manifests its influence most often through the conditions of nutrition and housing and the organization of the technological production process, while the influence of the birth season is manifested through microclimatic and nutritional conditions, as well. The most common deficiencies related to the nutrition of newborn calves are related to: inadequate colostrum supply in terms of quality, quantity and time of colostrum intake, which is closely related to the organization of the technological production process on the farm. Dietary deficiencies affect the body weight of calves at birth and at 8 days of age. In a study conducted over a year (4 seasons), the colostrum diet of newborn calves of the HF breed on two farms (A and B) with a tied housing system was analyzed. Calves were fed colostrum on both farms at intervals, usually up to 2 hours, less often up to 4 hours after birth. The colostrum consumed came from the mother, most often, and less often from the other cow, while on one of the farms it was also used frozen. However, the amount of colostrum consumed was deficient, it was 1-2 l on farm A, and 2.5 to 3 l on farm B. The occurence of a deficient diet or other deficiencies in the diet of calves was indicated by the average body weight, measured at birth and at the age of 8 days. On farm A, a lower average body weight of calves (37.95 and 39.68 kg) was recorded than on farm B (40.00 and 41.80 kg) by age categories, respectively. The average body weight of calves was statistically significantly (p <0.01) influenced by the farm and the season of birth, as well as their mutual interaction, but the effect of the farm was more pronounced.

Genetic effects on maternal performance and litter pre-weaning and post-weaning traits in rabbits

1984 ◽  
Vol 38 (2) ◽  
pp. 293-300 ◽  
Author(s):  
S. Lukefahr ◽  
W. D. Hohenboken ◽  
P. R. Cheeke ◽  
N. M. Patton
Keyword(s):  
Body Weight ◽  
New Zealand ◽  
Food Intake ◽  
Litter Size ◽  
Total Mortality ◽  
Litter Traits ◽  
Mortality Incidence ◽  
Teat Number ◽  
Maternal Performance ◽  
Daily Gain

AbstrtactFlemish Giant (FG) and New Zealand White (NZW) purebreds and terminal crossbreds (TX) (Flemish Giant sires × Florida White-New Zealand White dams) were evaluated during a 10-month period for maternal and litter pre-weaning and post-weaning performance. For the doe traits studied, teat number was greatest and litter interval was shortest, while body weight at breeding age (154 days), litter weight at 21 days and day 1 to 21 food intake were lowest for crossbred does. These traits were similar for pure doe groups, with the exception of body weight, for which FG does were heavier. For the preweaning litter traits examined (no. = 101 litters), litter size born was smallest in the TX group (the purebred groups being similar) and was largest at weaning (28 days) for NZW. Proportion of kits born alive was lowest in FG litters, while the NZW and TX groups were comparable. Litter and average birth and weaning weights, litter daily gain, and doe and litter food intake (1 to 28 days) were all highest in FG litters and lowest in TX litters. Repeatability estimates (t) were low (t < 0·05) for litter size and birth weight traits, and were moderate to high (0·18 < t < 0·58) for the remaining maternally influenced characters. For the post-weaning litter traits studied (no. = 86 litters), NZW litters were larger in number and heavier at market age (56 days), and consumed more food from 28 to 56 days than FG and TX litters. Purebred FG litters, however, had heavier average market weights per rabbit, while purebred NZW and TX litters were similar. Mortality due to respiratory disease was higher in FG litters than in NZW and TX litters. Total mortality incidence was lowest in the TX group.

Season of birth and relative body weight

1972 ◽  
Vol 25 (3) ◽  
pp. 279-281 ◽  
Author(s):  
Robert W. Hillman ◽  
Helen C. Conway
Keyword(s):  
Body Weight ◽  
Season Of Birth ◽  
Relative Body Weight

Factors affecting body weight at birth and at 90 days of age in pure-bred and cross-bred cattle in a tropical environment

1972 ◽  
Vol 78 (2) ◽  
pp. 227-231 ◽  
Author(s):  
M. B. Willis ◽  
P. D. P. Wood ◽  
A. Kaspar
Keyword(s):  
Body Weight ◽  
Birth Weight ◽  
Genetic Correlations ◽  
Tropical Environment ◽  
Seasonal Effect ◽  
General Tendency ◽  
Season Of Birth ◽  
Factors Affecting ◽  
Brown Swiss ◽  
Sex Effects

SUMMARYLive weights of 8764 calves born in seven herds in Cuba during the years 1966–8 were measured at birth and at approximately 3 months of age. Over 2600 were pure bred: Zebu (2002), Santa Gertrudis (435) and Charolais (212); the remainder were crossbred Holstein x Zebu (4955) and Brown Swiss x Zebu (1160).Year, season of birth, herd and sex were associated with variation in mean birth weight in all breeds and crosses except Charolais in which no seasonal effect was apparent and in Brown Swiss x Zebu cross-breeds in which herd and sex effects were absent.At 90 days there was a general tendency for calves born in late spring and summer to be heavier than those bom at other times. By this age, herd variation had subsided among Brown Swiss x Zebu cross-breds, and variation due to sex had ceased to be important among Charolais calves.Estimates of heritability of birth weight ranged from 0·09 in Holstein crosses to 0·62 in Brown Swiss crosses, and of weight at 90 days from 0·05 in Brown Swiss crosses to 0·44 in the Charolais breed. Phenotypic correlations between birth and 90 days weights were of the order of + 0·25 while genetic correlations were positive for pure breeds and negative for cross-breeds.

scholarly journals Evaluation of productive and reproductive performance of Black Bengal goat

2014 ◽  
Vol 43 (2) ◽  
pp. 104-111 ◽  
Author(s):  
RC Paul ◽  
ANMI Rahman ◽  
S Debnath ◽  
MAMY Khandoker
Keyword(s):  
Birth Weight ◽  
Milk Production ◽  
Reproductive Performance ◽  
Season Of Birth ◽  
Reproductive Parameters ◽  
Nucleus Breeding ◽  
Daily Milk Production ◽  
Birth Parity ◽  
Black Bengal Goat ◽  
Daily Milk

The present study was conducted with a view to know the productive and reproductive parameters of Black Bengal goat in a nucleus breeding flock of Bangladesh Agricultural University, and two other regions i.e., Modhupur (Tangail) and Dimla, (Nilphamari). Data were collected on a regular basis from January 2011 to January 2012. The results showed that birth weight of kids was significantly affected by type of birth (p<0.01), parity of dam (p<0.01) and season of birth (p<0.05) in three different regions. Yearling weight was varied significantly by sex of kid (p<0.01) and season of birth (p<0.05) in three different regions. Daily milk production was significantly affected by type of birth (p<0.01), parity of dam (p<0.01) and season of birth (p<0.01). Litter size and age at first conception were significantly affected by parity of dam. Kid mortality was significantly affected by season of birth (p<0.01) in nucleus flock. The results indicated that sex of kid, type of birth, parity of dam and season of birth influenced the productive and reproductive parameters in nucleus flock, Modhupur and Dimla and the performance also varied between nucleus flock and field levels.DOI: http://dx.doi.org/10.3329/bjas.v43i2.20704 Bang. J. Anim. Sci. 2014. 43 (2): 104-111

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