Genetic parameters for large white pigs reared under intensive management systems in Kenya

2016 ◽  
Vol 82 (1) ◽  
pp. 47-56 ◽  
Author(s):  
V. O. Ouko ◽  
E.D. Ilatsia ◽  
G. W. Oduho ◽  
D. K. Kios
Keyword(s):  
Genetic Parameters ◽  
Management Systems ◽  
Intensive Management ◽  
Large White

scholarly journals Genetic parameters of production and reproduetive traits in on a farm tested Danish Large White and Landrace swine in Greece

2000 ◽  
Vol 43 (3) ◽  
pp. 287-298
Author(s):  
J. Bizelis ◽  
A. Kominakis ◽  
E. Rogdakis ◽  
F. Georgadopoulou
Keyword(s):  
Maximum Likelihood ◽  
Genetic Correlation ◽  
Genetic Parameters ◽  
Genetic Correlations ◽  
Production Traits ◽  
Likelihood Methods ◽  
Large White ◽  
Reproduction Traits ◽  
Maximum Likelihood Methods ◽  
Genetic And Phenotypic Correlations

Abstract. Production and reproduetive traits in Danish Landrace (LD) and Large White (LW) swine were analysed by restricted maximum likelihood methods to obtain heritabilities as well as genetic and phenotypic correlations. Production traits were: age, backfat thickness (BT), muscle depth (MD) and the ratio BT/MD, adjusted to Standard bodyweight of 85 kg. Reproduction traits were: number of pigs born (NB) and number of pigs weaned (NW) per sow and parity. Heritabilities for age, BT, MD and BT/MD were 0.60, 0.44, 0.51 and 0.42 for LD and 0.36, 0.44, 0.37 and 0.45 for LW, respectively. Genetic correlations between age and BT were −0.22 in LD and – 0.44 in LW. The genetic correlation between age and MD was close to zero in both breeds. Genetic correlation between BT and MD were −0.36 and −0.25 in LD and LW, respectively. Heritabilities for NB were 0.25 in LD and 0.13 in LW while heritabilities for NW were close to zero in both breeds. Genetic correlation between NB and NW was 0.46 and 0.70 in LD and LW, respectively.

scholarly journals Genetic parameters of backfat fatty acids and carcass traits in Large White pigs

animal ◽  
2019 ◽  
Vol 13 (5) ◽  
pp. 924-932 ◽  
Author(s):  
R. Davoli ◽  
G. Catillo ◽  
A. Serra ◽  
M. Zappaterra ◽  
P. Zambonelli ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Genetic Parameters ◽  
Carcass Traits ◽  
Large White

scholarly journals Risk factors for Toxoplasma gondii and Neospora caninum seropositivity in buffaloes in Paraiba State, Brazil

2015 ◽  
Vol 24 (4) ◽  
pp. 459-463 ◽  
Author(s):  
Arthur Willian de Lima Brasil ◽  
Roberta Nunes Parentoni ◽  
Thais Ferreira Feitosa ◽  
Camila de Sousa Bezerra ◽  
Vinicius Longo Ribeiro Vilela ◽  
...  
Keyword(s):  
Risk Factors ◽  
Toxoplasma Gondii ◽  
Odds Ratio ◽  
Indirect Fluorescent Antibody Test ◽  
Neospora Caninum ◽  
Fluorescent Antibody ◽  
Antibody Test ◽  
Management Systems ◽  
Intensive Management ◽  
Factors Associated

Abstract The aims of this survey were to determine the frequency of anti-Toxoplasma gondii and anti-Neospora caninum antibodies and to identify the risk factors associated with seropositivity among buffaloes in the state of Paraíba, Brazil. This survey included 136 buffaloes belonging to 14 herds. To detect anti-T. gondii and anti-N. caninum antibodies, the indirect fluorescent antibody test (IFAT) was used. Among the 136 samples analyzed, 17 (12.5%) were positive for anti-T. gondii antibodies with titers ranging from 64 to 1,024, and 26 (19.1%) for anti-N. caninum with titers from 200 to 1,600. Animals seropositive for both T. gondii and N. caninum were found in 10 of the 14 herds (71.4%). Semi-intensive management systems (odds ratio = 2.99) and presence of pigs (odds ratio = 4.33) were identified as risk factors for T. gondii and N. caninum, respectively. It can be suggested that T. gondii and N. caninum are widespread in buffaloes in Paraíba, and that additional surveys are needed in order to ascertain the importance of these agents for this species and for pigs, and the influence of the farming type on occurrences of seropositive animals.

Genetic and non-genetic parameters related to embryo production in superovulated Large White (LW) gilts

2012 ◽  
Vol 134 (3-4) ◽  
pp. 177-183 ◽  
Author(s):  
V. Furstoss ◽  
F. Berthelot ◽  
M. Plat ◽  
E. Venturi ◽  
E. Royer ◽  
...  
Keyword(s):  
Genetic Parameters ◽  
Embryo Production ◽  
Large White

Genetic parameters and phenotypic trends in the mean and variability of number of stillborn piglets and changes in their relationships with litter size and gestation length

2013 ◽  
Vol 53 (5) ◽  
pp. 395 ◽  
Author(s):  
Craig R. G. Lewis ◽  
Susanne Hermesch
Keyword(s):  
Genetic Parameters ◽  
Gestation Length ◽  
Genetic Associations ◽  
Large White ◽  
Factors Affecting ◽  
Breed Differences ◽  
Trends Over Time ◽  
The Mean ◽  
Using Data ◽  
Over Time

This study examined changes in genetic and phenotypic factors affecting stillborn piglets (SB). Over 15 years, 76 851 litter records were available from Large White (LW), Landrace (LR) and Duroc (DU) sows to investigate SB. The analyses focussed on trends over time in SB and the changes in the number of SB per litter, in factors associated with SB and in genetic parameters for SB. Breed differences were identified with DU producing more SB than the white breeds (mean of 1.46 ± 0.02 vs 1.11 ± 0.01 and 1.07 ± 0.01). However, maximum differences between levels of each factor were 0.73 and 0.65 SB for parity and herd, respectively. Over the 15 years studied, SB had increased by 0.2 piglets accompanied by an increase in the total numbers of piglets born per litter (TB) of ~0.5 piglets. This increase in SB was driven by higher occurrence of more than two SB within a single litter. The effect of TB on SB changed over time with solutions of 0.127 ± 0.002 and 0.150 ± 0.002 SB/TB in 1996 and 2010, respectively. Heritability estimates for SB ranged from 0.06 ± 0.01 to 0.09 ± 0.01 for alternative models and time periods. The unfavourable genetic correlation between SB and TB of 0.46 ± 0.03 based on all data available was slightly lower using only data from the first 5 years (0.38 ± 0.07) versus using data from the last 5 years (0.46 ± 0.06). However, this increase in phenotypic and genetic associations between SB and TB over time may be larger in populations that have observed a larger increase in TB.

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