Estimation of genetic parameters for litter traits in grasscutters (Thryonomys swinderianus)

2014 ◽  
Vol 54 (10) ◽  
pp. 1762
Author(s):  
A. J. Henry ◽  
S. N. Ibe ◽  
B. O. Asuquo
Keyword(s):  
Genetic Correlation ◽  
Positive Relationship ◽  
Genetic Parameters ◽  
Heritability Estimate ◽  
Thryonomys Swinderianus ◽  
Litter Weight ◽  
Unbalanced Design ◽  
Litter Traits ◽  
Estimation Of Genetic Parameters

A study was conducted to estimate genetic parameters for litter traits in grasscutters. Data were obtained using 209 progenies from an unbalanced design of 18 does nested under six bucks. Heritability values of 0.56 ± 0.21 and 0.22 ± 0.22 were obtained for litter weight at birth from dam component and both sire and dam components, respectively. For litter weight at weaning, the heritability estimate was 0.66 ± 0.22 using the dam component of variance. Genetic correlation between litter weight at birth and litter weight at weaning was 0.59 revealing a positive relationship between both traits.

scholarly journals Estimation of Genetic Parameters of Turiaçu Pineapple Clones and Genetic Correlation between Traits

2017 ◽  
Vol 08 (11) ◽  
pp. 1253-1262
Author(s):  
Guilherme Barbosa Abreu ◽  
Marcos Miranda Toledo ◽  
Marcelo Mattos Cavallari ◽  
José Ribamar Gusmão Araújo ◽  
Antônia Alice Costa Rodrigues ◽  
...  
Keyword(s):  
Genetic Correlation ◽  
Genetic Parameters ◽  
Estimation Of Genetic Parameters

Genetic Parameters for Pre-Weaning Litter Traits in Heterogeneous Population of Rabbits (Oryctolagus cuniculus) Raised in the Humid Tropics

2019 ◽  
Author(s):  
A I Adeolu ◽  
V.U Oleforuh Okoleh ◽  
W Mathew ◽  
R U Onyeneke ◽  
R N Nwose ◽  
...  
Keyword(s):  
Litter Size ◽  
Oryctolagus Cuniculus ◽  
Selection Criteria ◽  
Genetic Parameters ◽  
Humid Tropics ◽  
Heterogeneous Population ◽  
Litter Weight ◽  
Litter Traits ◽  
Derived Savanna ◽  
Size At Birth

Data from 302 progeny in a heterogeneous population of rabbits were used to estimate the heritability and correlations (phenotypic and genetic) of pre-weaning litter traits (litter size at birth LSB, litter size at weaning LSW, litter weight birth LWB, litter weight at weaning LWW, kit weight birth KWB, and kit weight weaning KWW). Heritability estimates for litter size ranged from 0.16 (LSW) to 0.22 (LSB). LWB and LWW were more highly heritable (0.52 and 0.55 respectively) than KWB and KWW (0.36 and 0.25 respectively). The genetic (rG ) and phenotypic (rP) correlations between litter size and litter weight at birth and weaning were 0.69 to 0.88 (rG) and 0.28 to 0.88 (rP). Generally, litter traits gave higher estimates than individual kit traits implying that selection criteria based on litter performance rather than on individual kit performance should be applied in genetic improvement of pre-weaning traits in rabbits raised in derived savanna zone.

scholarly journals Multi-trait and repeatability models for genetic evaluation of litter traits in pigs considering different farrowings

2016 ◽  
Vol 17 (4) ◽  
pp. 666-676 ◽  
Author(s):  
Edson Vinícius COSTA ◽  
◽  
Henrique Torres VENTURA ◽  
Elsio Antônio Pereira FIGUEIREDO ◽  
Fabyano Fonseca e SILVA ◽  
...  
Keyword(s):  
Akaike Information Criterion ◽  
Genetic Parameters ◽  
Information Criterion ◽  
Genetic Evaluation ◽  
Litter Weight ◽  
The Third ◽  
Litter Traits ◽  
The Mean ◽  
Trait Model ◽  
Almost All

SUMMARY We aimed to compare multi-trait and repeatability models to estimate genetic parameters for the traits number of piglets born alive (NBA) and alive at 3 week of age (NP3), litter weight at birth (LW0) and at 3 week of age (LW3), and mean piglet weight at birth (MW0) and at 3 week of age (MW3), considering the first three farrowings of Landrace sows. Heritability (h2) estimates showed an increasing pattern up to the third farrowing for LW0 and MW3. For NBA, NP3, LW3, and MW0 h2 increased from the first to the second and decreased from the second to the third farrowing. In general, heritability estimated in the repeatability model was lower than the mean of the estimates in the multi-trait model. The traits LWO, MW0, and MW3 presented high genetic correlation among different farrowings (0.961–0.997), while NBA, NP3, and LW3 (0.092–0.986) presented irregular values among farrowings. The corrected Akaike information criterion shows that the repeatability model is not indicated for almost all of the studied traits. These results indicate that the multi-trait model is recommended for genetic evaluation of the traits number of piglets born alive and alive at 3 week of age, litter weight and mean piglet weight at birth and 3 week of age, in different farrowings, as different traits.

scholarly journals Estimation of Genetic Parameters of Turiaçu Pineapple Clones and Genetic Correlation between Traits

2017 ◽  
Vol 08 (11) ◽  
pp. 1253-1262
Author(s):  
Guilherme Barbosa Abreu ◽  
Marcos Miranda Toledo ◽  
Marcelo Mattos Cavallari ◽  
José Ribamar Gusmão Araújo ◽  
Antônia Alice Costa Rodrigues ◽  
...  
Keyword(s):  
Genetic Correlation ◽  
Genetic Parameters ◽  
Estimation Of Genetic Parameters

Genetic parameters for Australian maternal and dual-purpose meatsheep breeds. I. Liveweight, wool production and reproduction in Border Leicester and related types

1994 ◽  
Vol 45 (2) ◽  
pp. 459 ◽  
Author(s):  
LD Brash ◽  
NM Fogarty ◽  
SA Barwick ◽  
AR Gilmour
Keyword(s):  
Genetic Correlation ◽  
Litter Size ◽  
Genetic Parameters ◽  
Genetic Correlations ◽  
Heritability Estimate ◽  
Reproductive Traits ◽  
Phenotypic Correlation ◽  
Data Set ◽  
Reproduction Traits ◽  
Fleece Weight

Analyses of two separate Border Leicester data sets are reported. In the first set, genetic parameters were estimated for 14 month liveweight and greasy fleece weight from 1312 ewe and ram records representing 75 sires of the Border Leicester and Glen Vale breeds (a related genotype) using derivative-free REML procedures. The heritability estimate for liveweight was 0.24 � 0.07 and greasy fleece weight was 0.17 � 0-05, with the genetic correlation being -0 21 � 0 -30 and phenotypic correlation 0.54 � 0.02. In the second data set, reproductive performance was analysed and genetic parameters were estimated from 7395 joining records for 1604 ewes, representing 165 sires, from two Border Leicester stud flocks. Reproduction traits analysed were fertility (ewes lambing of ewes joined), litter size (lambs born per ewe lambing) and lambs born (per ewe joined). The studs differed in performance for all reproductive traits; fertility (67 v. 82%), litter size (1-27 v. 1-43) and lambs born (85 v. 117%). The estimates of heritability and repeatability respectively for ewe performance were: fertility 0.01 � 0.01 and 0.05 � 0 01, litter size 0.01 � 0.02 and 0.05 � 0.01, lambs born 0.00 � 0.01 and 0.06 � 0.01. Estimates of heritability for average ewe lifetime performance were 0.04% 0.05 for fertility, 0-02 �0.05 for litter size and 0.03 � 0.05 for lambs born, based on averages of 4.6 joining and 3.5 litter size records for ewes. The genetic correlations between lambs born and its components fertility (0.96 � 0.18) and litter size (0.83 � 0.44) were high, with the genetic correlation between fertility and litter size being 0.65 � 0.52. Implications for breeding programs for Border Leicester flocks within LAMBPLAN are discussed.

Estimation of genetic parameters for litter size in sheep: a comparison of a repeatability and a multivariate model

1998 ◽  
Vol 66 (3) ◽  
pp. 685-688 ◽  
Author(s):  
M. J. de Vries ◽  
E. H. van der Waaij ◽  
J. A. M. van Arendonk
Keyword(s):  
Animal Model ◽  
Genetic Correlation ◽  
Litter Size ◽  
Genetic Parameters ◽  
Genetic Correlations ◽  
Multivariate Model ◽  
Phenotypic Variance ◽  
Multiple Trait ◽  
Environmental Correlations ◽  
Estimation Of Genetic Parameters

AbstractGenetic parameters were estimated for litter size in two prolific sheep breeds, i.e. the Zwartbles and the synthetic breed Swifter. Genetic parameters and breeding values for litter size in different parities were estimated using both a repeatability and a multivariate animal model. The estimated heritability from the repeatability model was 0·10 for the Zwartbles and 0·12 for the Swifter. For the multivariate model, heritability of litter size in first, second and third parity was 0·05, 0·07 and 0·10 for the Zwartbles and 0·09, 0·12 and 0·09 for the Swifter. Genetic correlation for litter size in Swifter was 0·81 between parity 1 and 2 and 0·99 between parity 2 and 3. For the Zwartbles genetic correlations were all very close to unity. Environmental correlations between litter size in subsequent parities were not constant over parities. Phenotypic variance in litter size in both breeds was 0·309 in first parity and was almost 50% higher in later parities. Based on the results it is recommended to apply a multiple trait model.

scholarly journals Genetic parameters for Finnish blue fox population: litter size, age at first insemination and pelt size

2008 ◽  
Vol 16 (2) ◽  
pp. 136 ◽  
Author(s):  
J. PEURA ◽  
I. STRANDÉN ◽  
E.A. MÄNTYSAARI
Keyword(s):  
Animal Model ◽  
Genetic Correlation ◽  
Litter Size ◽  
Genetic Parameters ◽  
Heritability Estimate ◽  
Blue Fox ◽  
Mated Female

Pelt size has increased rapidly in the Finnish blue fox population during the last decade. However, average number of pups per mated female has slightly decreased after the mid-1990’s. In this study we estimated genetic parameters of litter size in the first two parturitions, age of female at first insemination, and pelt size with a linear multitrait animal model. Heritability of litter size in first and second parturition was 0.06 and 0.10, respectively. Heritability estimate for age at first insemination was 0.15 and for pelt size 0.29. Genetic correlation between pelt size and first litter size was –0.30, between first and second litter size 0.76, and between second litter size and age at first insemination 0.70. Thus, genetic correlation between fertility and pelt size was unfavorable.;

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