scholarly journals A comparative study of litter size and sex composition in a large dataset of callitrichine monkeys

2019 ◽  
Vol 81 (9) ◽  
Author(s):  
Dakota E. McCoy ◽  
Brett M. Frye ◽  
Jennifer Kotler ◽  
Judith M. Burkart ◽  
Monika Burns ◽  
...  
Keyword(s):  
Comparative Study ◽  
Litter Size ◽  
Sex Composition ◽  
Large Dataset ◽  
Size And Sex Composition

Performance of lambs from three crossbred ewe types

1984 ◽  
Vol 39 (1) ◽  
pp. 81-87 ◽  
Author(s):  
N. D. Cameron ◽  
C. Smith ◽  
F. K. Deeble
Keyword(s):  
Comparative Study ◽  
Litter Size ◽  
Survival Rates ◽  
England And Wales ◽  
Second Stage

ABSTRACTThe performance of predominantly Suffolk-sired lambs from Border Leicester (BL), Bluefaced Leicester (BFL) and ABRO Damline (DL) crossbred ewes was compared on 18 commercial and college farms throughout England and Wales. The comparison took place over the 5-year period 1977 to 1981 and was the second stage in a comparative study on the productivity of the crossbred ewes. A total of 1277 crossbred ewes were involved with data on up to 3 years lambings per ewe, giving a total of 3522 mating records and 4864 lamb records.The BFL lambs were heaviest and the DL lambs were lightest. The DL lambs had the lowest survival rates, and the BFL lambs the highest. The BFL lambs were slaughtered earlier (12 days) and at heavier weights (1·4 kg) than the DL and BL lambs, and had slightly heavier carcasses. The DL and BFL carcasses had better MLC carcass classifications than the BL, resulting in an advantage of 4 p/kg of carcass.In productivity per ewe, the BFL litters had the highest slaughter and carcass weights and the highest income per litter, with the DL litters intermediate. An attempt was made to express productivity per unit of sheep weight maintained, taking account of ewe weight, litter size and the lamb slaughter date. On this index, the DL were marginally superior to the BFL, and both were superior to the BL.

A comparative study of fat and protein levels in the colostrum of prolific and non-prolific sheep

1998 ◽  
Vol 1998 ◽  
pp. 104-104
Author(s):  
J.M.L. Anderson ◽  
M.N.I. Barclay ◽  
M. J. Harvey ◽  
A. Waterhouse
Keyword(s):  
Body Weight ◽  
Comparative Study ◽  
Litter Size ◽  
Protein Levels

It is vital that lambs receive at least 50ml/kg body weight of colostrum as soon as possible after birth. Without this, the lamb will be deprived quickly of energy for thermoregulation, as well as antibody protection. Colostrum contains high levels of fats and lactose, proteins and vitamins; however the consistency and colour vary between individual animals. Little is known of the cause of these variations. This experiment aimed to examine whether there were breed, age, genotype and litter size differences in the fat and protein levels of ewe colostrum collected within one hour of parturition.

A comparative Study of Regularized Regression Approaches using R: Application to SNP and Litter Size of Yorkshire Pigs

2014 ◽  
Vol 48 (3) ◽  
pp. 147-155
Author(s):  
Minsu Park ◽  
◽  
Tae-Hun Kim ◽  
Eun-Seok Cho ◽  
Heebal Kim ◽  
...  
Keyword(s):  
Comparative Study ◽  
Litter Size ◽  
Regularized Regression ◽  
Yorkshire Pigs

scholarly journals Variant <i>GDF9</i> mRNA is likely not the main cause of larger litter size in Iranian Lori-Bakhtyari, Shal, Ghezel, and Afshari sheep breeds

2017 ◽  
Vol 60 (2) ◽  
pp. 119-129 ◽  
Author(s):  
Shahin Eghbalsaied ◽  
Farzad Rashidi Khorasgani ◽  
Hamid-Reza Amini ◽  
Majid Farahi ◽  
Maryam Davari ◽  
...  
Keyword(s):  
Litter Size ◽  
Signal Peptide ◽  
Large Dataset ◽  
Sheep Breeds ◽  
Signal Peptide Region ◽  
Twin Birth ◽  
Significant Difference ◽  
Pcr Rflp ◽  
Peptide Region ◽  
Gdf9 Gene

Abstract. This study was carried out to screen the GDF9 gene and evaluate the polymorphism effect on litter size of four Iranian sheep breeds using the PCR-RFLP and PCR-SSCP methods. First, sequencing of the GDF9 gene in 16 twin-birth, 4 triplet-birth, and 2 infertile ewes showed that, in addition to G2, G3, G4, G5, and G6 mutations that have been previously reported in other breeds, a new G0 mutation, called C25T, exists in the GDF9 sequence of 1 out of 22 ewes and causes L9F substitution in the signal peptide region. None of the triplet-birth or infertile ewes carried G1, G4, G7, FecGE, G8, or FecGT mutations. In the second experiment, a large dataset was used: 605 individuals including 496 ewes (145 Afshari, 54 Shal, 126 Ghezel, and 171 Lori-Bakhtyari sheep), and 109 rams (26 Afshari, 23 Shal, 10 Ghezel, and 50 Lori-Bakhtyari sheep. There were no sheep carrying the G7, G8, or Thoka mutations. Among all 109 rams that were used in this study, none of them were homozygous for the G1 mutation. Moreover, abundance of heterozygote rams (G1/G+) varied from 0.0 (Afshari) to 28.6 % (Lori-Bakhtyari and Ghezel). The highest and the lowest frequencies of the G4 mutation were 30.6 and 3.0 % in Shal and Afshari breeds, respectively. Moreover, G4 abundance varied from 0.0 to 42.3 %, from 3.0 to 26.9, and from 3.0 to 30.6 % in rams, ewes, and overall, respectively. There was a significant difference in the abundance of G1 and G4 mutations between breeds. However, neither the G1 nor the G4 mutation was associated with litter size in Afshari, Ghezel, Lori-Bakhtyari, or Shal sheep breeds. In conclusion, the results of this study showed that GDF9 G1 and G4 mutations are not the reason for higher litter size in Iranian sheep. Moreover, the GDF9 G0 and G6 mutations do not cause triplet births or infertility in Iranian ewes. Therefore, it is unlikely that variant GDF9 mRNA induces larger litter size or infertility in Iranian ewes.

Size and Sex Composition of Population in India, 1901-1961.

1970 ◽  
Vol 35 (6) ◽  
pp. 1141
Author(s):  
Edgar Chasteen ◽  
P. B. Desai
Keyword(s):  
Sex Composition ◽  
Size And Sex Composition
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