Study of sire selection in view of genetic relation involving fitness traits in Malpura sheep in an organized farm of Rajasthan, India

2017 ◽  
Author(s):  
Govind Mohan ◽  
G. R. Gowane ◽  
Arun Kumar ◽  
A. K. Chakravarthy
Keyword(s):  
Sex Ratio ◽  
Production Parameter ◽  
Replacement Rate ◽  
Genetic Relation ◽  
Production Parameters ◽  
Fitness Traits ◽  
Adaptive Value ◽  
Total Female ◽  
Selection Of ◽  
Sire Selection

The genetics of fitness traits, viz. replacement rate (RR) and selective value (SV) were studied in the flock of Malpura Sheep along the production parameters of the animals. The study was carried out on 10 years records for 2307 lambing sired by 187 sires. Sire wise incidence of replacement traits was as follows: abnormal birth (0.30%), sex ratio (49.98%), mortality (17.26%), culling (15.37%), RR on total lamb basis (33.98%) and RR on female lamb basis (68.44%). The selective value or adaptive value for the flock was 1.37. Sire did not affect abnormal birth, mortality, culling and SV significantly, whereas sire significantly affected sex ratio, and RR on total female lambs born basis. Ranking of the sires for selective value was incoherent with the ranking for production parameters such as age at first service, age at first lambing, weight at first service, productive flock life and longevity. Study indicated that the selection of sires for SV would not bring desired correlated change on any of the production parameter of the animals.

Effect of different water temperatures on sex ratio, gonad development and production parameters of common carp ( Cyprinus carpio L.)

2019 ◽  
Vol 51 (2) ◽  
pp. 858-862
Author(s):  
László Kovács ◽  
Dániel Minya ◽  
Dávid Homoki ◽  
Odunayo Abigeal Toviho ◽  
Milán Fehér ◽  
...  
Keyword(s):  
Sex Ratio ◽  
Common Carp ◽  
Cyprinus Carpio ◽  
Gonad Development ◽  
Production Parameters ◽  
Common Carp Cyprinus Carpio ◽  
Carp Cyprinus Carpio

The sex ratio of a gilt’s birth litter can affect her fitness as a breeding female

2018 ◽  
Vol 58 (9) ◽  
pp. 1567 ◽  
Author(s):  
J. Seyfang ◽  
R. N. Kirkwood ◽  
A. J. Tilbrook ◽  
C. R. Ralph
Keyword(s):  
Sex Ratio ◽  
Reproductive Performance ◽  
Reproductive Potential ◽  
Group Housing ◽  
Pork Industry ◽  
Welfare Issue ◽  
Breeding Herd ◽  
Uterine Environment ◽  
Animal Welfare Issue ◽  
Selection Of

Lifetime reproductive performance and behaviour are established in utero driven by genetics and the steroidal milieu of the uterine environment. Developing males synthesise androgens that can be absorbed by females in the litter. Consequently, the proportion of males in a litter has the potential to affect both lifetime reproductive performance and behaviour of female littermates. Although reproductive potential is understandably important for gilt selection, behaviour is becoming progressively more important as group housing of sows increases. Aggression can be a cause for removal from the breeding herd, and can also negatively affect reproductive performance and herd longevity. This review covers existing evidence of masculinisation in rodents and sheep, the mechanism causing masculinisation, and the knowledge gaps surrounding masculinisation in pigs. Premature culling of gilts is an economic and animal welfare issue in the pork industry resulting in low retention of gilts and reduced productivity. The selection of gilts needs to be improved to incorporate both lifetime reproductive potential and behaviour. We determined that there is cause to investigate the effect of the birth litter sex ratio of a gilt on her suitability for selection into the breeding herd.

Evolutionary selection of interesting class association rules using genetic relation algorithm

2011 ◽  
Vol 6 (5) ◽  
pp. 431-440 ◽  
Author(s):  
Eloy Gonzales ◽  
Shingo Mabu ◽  
Karla Taboada ◽  
Kaoru Shimada ◽  
Kotaro Hirasawa
Keyword(s):  
Association Rules ◽  
Evolutionary Selection ◽  
Genetic Relation ◽  
Interesting Class ◽  
Selection Of

Behavioural differences between locally recruiting and dispersing gray squirrels, Sciurus carolinensis

1990 ◽  
Vol 68 (5) ◽  
pp. 935-941 ◽  
Author(s):  
M. Pasitschniak-Arts ◽  
J. F. Bendell
Keyword(s):  
Sex Ratio ◽  
Laboratory Tests ◽  
Population Regulation ◽  
Tail Length ◽  
Sciurus Carolinensis ◽  
Colour Morph ◽  
Resident Population ◽  
Behavioural Type ◽  
Local Recruitment ◽  
Selection Of

We tested the hypothesis that recruitment into a resident population involved the selection of an independently defined behavioural type of animal. Gray squirrels were captured in or shortly after leaving their nests, held in the laboratory in a similar manner, and their behavioural profiles and other properties were determined. The following spring, they were released into the area where most were captured and which we virtually emptied of residents prior to the release. Sixty days following the release, 64% (18/28) of the squirrels had dispersed, most before 10 days, and the remainder recruited and became residents. From the laboratory tests, local recruits compared with dispersers were on average more aggressive. There were no clear differences between the two types in mass, tail length, and sex ratio. All were sexually immature. Recruits were more active than dispersers in December, and activity of both appeared to decline from November to April. Proportionately more of the pepper morph recruited than of the black and gray morphs. There appear to be genetic behavioural and colour morph differences among squirrels that affect or are linked to their local recruitment or dispersal and population regulation.

scholarly journals Selection of Trichogramma species for controlling the Diamondback moth

2008 ◽  
Vol 26 (2) ◽  
pp. 259-261 ◽  
Author(s):  
Dirceu Pratissoli ◽  
Ricardo A Polanczyk ◽  
Anderson M Holtz ◽  
Leandro P Dalvi ◽  
Alexandre F Silva ◽  
...  
Keyword(s):  
Sex Ratio ◽  
Plutella Xylostella ◽  
Diamondback Moth ◽  
Egg Parasitoids ◽  
Biological Characteristics ◽  
Parasitism Rate ◽  
Trichogramma Species ◽  
The One ◽  
Selection Of

Biological characteristics of the egg parasitoids Trichogramma acacioi, T. atopovirilia, and T. bennetti were studied to select the one with better performance on the control of the Diamondback moth, Plutella xylostella. Parasitism rate, viability, and sex ratio were studied. Parasitism rate ranged from 1.67 to 41.33%. T. atopovirilia and T. acacioi were respectively the most and less aggressive species. The viability ranged from 6.20% for T. acacioi to 53.34% for T. atopovirilia. There were no differences on sex ratio (p<0.05) that remained above 0,88. T. atopovirilia was the species with best performance in the laboratory when rearing on the Diamondback moth eggs.

Younger bank voles are more vulnerable to avian predation

2008 ◽  
Vol 86 (9) ◽  
pp. 1074-1078 ◽  
Author(s):  
Taru Meri ◽  
Matti Halonen ◽  
Tapio Mappes ◽  
Jukka Suhonen
Keyword(s):  
Sex Ratio ◽  
Clethrionomys Glareolus ◽  
Selective Predation ◽  
Field Sample ◽  
Avian Predator ◽  
Avian Predation ◽  
Bank Voles ◽  
Significant Difference ◽  
Total Impact ◽  
Selection Of

The importance of predation on prey populations is mainly determined by the number of eaten prey. However, the total impact of predation might also be determined by the selection of certain prey individuals, e.g., different sexes or age categories. Here we tested selective predation by an avian predator, the pygmy owl ( Glaucidium passerinum (L., 1758)), on bank voles ( Myodes ( Clethrionomys ) glareolus (Schreber, 1780)). We compared the sex, age, and mass of hoarded prey with the animals snap-trapped from the field. There were no differences in the sex ratio between hoarded bank voles and those available in the field. However, hoarded voles were significantly younger than ones in the field sample. There was no statistically significant difference in mass between animals from larders and from the field. We suggest that the greater vulnerability of younger animals to predation might be due to their higher activity, or alternatively, they might be forced to forage in less safe habitats.

Sex differences may indeed exist for 3-D navigational abilities: But was sexual selection responsible?

1998 ◽  
Vol 21 (3) ◽  
pp. 443-444 ◽  
Author(s):  
Peter Frost
Keyword(s):  
Sex Differences ◽  
Sexual Selection ◽  
Sex Ratio ◽  
Mortality Rates ◽  
Operational Sex Ratio ◽  
Hunter Gatherers ◽  
Selection Of

Polygyny does not necessarily entail sexual selection of men. All factors that affect the operational sex ratio must be considered. Data from contemporary hunter-gatherers indicate higher mortality rates in men than in women, and lost female reproductive time. If sexual selection did occur in ancestral hunter-gatherers, it was probably men selecting women and not women selecting men.

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