Genetic parameters of type traits in two strains of dual purpose autochthonous Valdostana cattle

Mazza, Serena; Sartori, Cristina; Mantovani, Roberto

doi:10.1016/j.livsci.2015.06.008

Cited by 13 publications

(27 citation statements)

References 31 publications

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“…The two breeds are linked by a comparable milk production (3700 kg/lactation per cow in ARP and 5200 kg/lactation per cow in REN) and similar milk characteristics (about 3.5% of fat and 3.3% of protein in both breeds). The two breeds have also a similar chart used for linear type evaluation, accounting for 20 and 22 linear type traits, for REN and ARP, respectively, and the same four composite traits, that is, body size, muscularity, body shape and udder (see for description Mazza et al, 2014 and2015). The main differences between the two charts (Mazza et al, 2014 and2015) are the addition of rump length and teat placement side view in ARP compared to REN, and a different expression of one trait within the group of body size (thorax width in ABP is exchanged with thorax length in REN) and in the group of muscularity traits (front muscularity in ABP is replaced by the shoulder fore view score in REN).…”

Section: Methodsmentioning

confidence: 99%

“…The two breeds have also a similar chart used for linear type evaluation, accounting for 20 and 22 linear type traits, for REN and ARP, respectively, and the same four composite traits, that is, body size, muscularity, body shape and udder (see for description Mazza et al, 2014 and2015). The main differences between the two charts (Mazza et al, 2014 and2015) are the addition of rump length and teat placement side view in ARP compared to REN, and a different expression of one trait within the group of body size (thorax width in ABP is exchanged with thorax length in REN) and in the group of muscularity traits (front muscularity in ABP is replaced by the shoulder fore view score in REN). Last of all, the thinness score in the two breeds has opposite biological extremes, that is, the minimum is fine in ABP and heavy in REN, and vice versa for the maximum score (Mazza et al, 2014 and2015).…”

Section: Methodsmentioning

confidence: 99%

“…The main differences between the two charts (Mazza et al, 2014 and2015) are the addition of rump length and teat placement side view in ARP compared to REN, and a different expression of one trait within the group of body size (thorax width in ABP is exchanged with thorax length in REN) and in the group of muscularity traits (front muscularity in ABP is replaced by the shoulder fore view score in REN). Last of all, the thinness score in the two breeds has opposite biological extremes, that is, the minimum is fine in ABP and heavy in REN, and vice versa for the maximum score (Mazza et al, 2014 and2015). All traits for both breeds were scored using a 1 to 5-point scale system by specialized classifiers within annual rounds of evaluations (approximately from February to May) that are aimed at scoring all primiparous cows after calving (usually falling between October and December due to the strong seasonality).…”

Section: Methodsmentioning

confidence: 99%

“…The same model was previously used for analysing the only linear type traits on the same breeds (Mazza et al, 2014 and2015). Therefore, the model considered for the REML single-trait analysis was as follows:…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, the aim of the present study was to consider the use of the factor analysis as a method of investigating the relationships between type traits in two Italian local dual purpose populations characterized by a similar morphological evaluation chart and an identical scoring system. Both the Rendena and the Aosta Red Pied breeds have been previously investigated for the genetics of the individual linear type traits and analytically described (Mazza et al, 2013(Mazza et al, , 2014(Mazza et al, and 2015. Being part of a wider project aimed at implementing a global selection index in these dual purpose breeds, this study also set out to investigate the use of factor scores as a tool for obtaining breeding values to be implemented in animal breeding.…”

Section: Introductionmentioning

confidence: 99%

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Factor analysis for genetic evaluation of linear type traits in dual-purpose autochthonous breeds

Mazza

Guzzo

Sartori

et al. 2016

Animal

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Factor analysis was applied to individual type traits (TT) scored in primiparous cows belonging to two dual purpose Italian breeds, Rendena (REN; 20 individual type traits evaluated on 11 399 first parity cows), and Aosta Red Pied (ARP; 22 individual type traits evaluated on 36 168 primiparous cows). Six common latent factors (F1 to F6; eigenvalues ⩾ 1) which explained 63% (REN) and 58% (ARP) of the total variance were obtained. F1 included TT mainly related to muscularity, and F2 to body size. The F3 and F4 accounted for udder size and conformation, respectively. F5 included rear legs and feet. Biological significance for F6 was not readily obtained. Moderate to low heritability were estimated through REML single-trait analysis from factor scores (from 0.22 to 0.52 in REN, and from 0.08 to 0.37 in ARP). The greatest heritability values were estimated for body size and muscularity (0.52 and 0.37 for body size; and 0.40 and 0.32 for muscularity in REN and ARP, respectively). As expected, rank correlations, obtained considering estimated breeding values derived from best linear unbiased prediction analysis on the individual TT and factor score, showed similar coefficients to those observed in the factor analysis following loading of TT within each latent factor. These results suggest the possibility to implement the factor analysis in the morphological evaluation, simplifying the information given by the type traits into new variables useful for the genetic improvement of dual purpose cattle.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Factor analysis for genetic evaluation of linear type traits in dual-purpose autochthonous breeds

Mazza

Guzzo

Sartori

et al. 2016

Animal

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Analysis of genetic correlations between beef traits in young bulls and primiparous cows belonging to the dual-purpose Rendena breed

Guzzo¹,

Sartori²,

Mantovani³

2019

Animal

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Selection for beef traits in Italian dual-purpose breeds is often carried out using growth and in vivo conformation recorded on young, performance tested bulls and muscularity traits scored during routinely linear type evaluation on primiparous cows. In this context, the knowledge of the genetic structure of traits obtained in different sexes and at different times is necessary for a proper selection plan. This study aimed to estimate, in the local dual-purpose Rendena breed, the genetic relationships between muscularity linear type traits from primiparous cows, the same traits scored on candidate young bulls, and the performance test traits recorded in candidate young bulls. Type traits included: front (chest and shoulder), back (loins and rump); thigh, buttocks side and rear views (two traits). Performance test traits were: average daily gain; EUROP fleshiness evaluation; and dressing percentage. Muscularity linear type traits were recorded on 11 992 first parity cows, and the muscularity type traits were scored on 957 candidate young bulls. Heritability estimates obtained for muscularity traits were moderate in young bulls (on average 0.326), about 16% higher than in primiparous cows. The average heritability for performance test traits in young bulls resulted 0.342. Moderate to strong genetic correlations were found between performance test and muscularity type traits collected in young bulls (from 0.500 between front (chest and shoulder) and average daily gain to 0.955 between thigh, buttocks side view and in vivo dressing percentage). The genetic relationships obtained between muscularity linear type traits of primiparous cows and performance traits of young bulls were variable (from a null correlation between front (chest and shoulder) and average daily gain to 0.822 between thigh, buttocks rear view and dressing percentage), with an average genetic correlation of 0.532. Generally, the traits measured during performance testing in young bulls were favourably correlated with muscularity traits evaluated on primiparous cows, indicating a common selection pathway.

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Beef quality in two autochthonous Valdostana breeds fattened in alpine transhumance: effect of lowland finishing and meat ageing

Kreuzer

Pervier

Turille³

et al. 2021

Italian Journal of Animal Science

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European consumers demand locally produced meat, preferably from regional breeds, but meat quality is unknown. Heifers from two dual-purpose breeds, Valdostana Chestnut (VC) and Valdostana Red Pied (VR), autochthonous to the Aosta valley, were compared with Piedmontese (PI), a beef breed. Fourteen VC and VR each grazed high alpine pastures, and ten PI received fresh grass in a lowland barn. In each group, the heavier half of the animals were slaughtered after the grass-feeding period. All others received hay and concentrate for another 48 days. Properties of the carcase and the longissimus thoracis (LT) and biceps femoris (BF) muscles (aged 7 or 28 days) were determined. Sensory analysis of the LT and BF muscles was performed by 10 trained panellists and 53 consumers, respectively. The VC and VR grew faster than the PI, but dressing percentages and conformation scores were inferior. The LT was perceived as less tender from the VC and VR compared to the PI, and shear force and insoluble collagen were also higher. Finishing accentuated the problem for VC and did not improve carcase and meat quality otherwise. Prolonged ageing did not render the beef more tender. Compared to the LT, the BF was more resistant to factors of influence in quality. Consumers perceived long-aged beef to be preferable and comparably inexpensive for its quality. No other factor influenced sensory impression. In conclusion, the LT and, less so, the BF from the autochthonous breeds were not fully competitive in quality with those of the beef breed. HIGHLIGHTSGrass-fed autochthonous Valdostana breeds were compared with Piedmontese cattle. Valdostana heifers performed better but were inferior in dressing percentage and carcase conformation. The beef from the Valdostana breeds was less tender than that from the Piedmontese.

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Genetic parameters of type traits in two strains of dual purpose autochthonous Valdostana cattle

Cited by 13 publications

References 31 publications

Factor analysis for genetic evaluation of linear type traits in dual-purpose autochthonous breeds

Factor analysis for genetic evaluation of linear type traits in dual-purpose autochthonous breeds

Analysis of genetic correlations between beef traits in young bulls and primiparous cows belonging to the dual-purpose Rendena breed

Beef quality in two autochthonous Valdostana breeds fattened in alpine transhumance: effect of lowland finishing and meat ageing

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