Genetic evaluation for length of productive life in Slovak Pinzgau cattle

Mészáros, Gábor; Fuerst, Christian; Fuerst-Waltl, Birgit; Kadlečík, Ondrej; Kasarda, Radovan; Sölkner, Johann

doi:10.5194/aab-51-438-2008

Cited by 29 publications

(47 citation statements)

References 19 publications

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“…Selected traits of the udder belong among functional traits affecting the length of productive life (MéSZáROS et al 2008). The values of the external proportions of the teat were higher in Czech Fleckvieh cows (C) in comparison with Holstein (H).…”

Section: Resultsmentioning

confidence: 99%

Changes in teat parameters caused by milking and their recovery to their initial size

et al. 2010

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Dairy cows of 2 breeds, 74 Holstein (H) and 72 Czech Fleckvieh (C) cows in the 1st (H, n=38; C, n=38) and 2nd lactation (H, n=36; C, n=34) during the 1st period (n=74; H, n=40; C, n=34; to 150 days) and the 2nd period of lactation (n=72; H, n=34; C, n=38; above 150 days) were observed. Differences in external and internal proportions of teat closely before (the 1st measurement), immediately after (the 2nd measurement) and 3 h after milking (the 3rd measurement), udder conformation evaluated by linear description, somatic cell count, daily milk yield and the time of milking were evaluated in relation to the effect of breed and period of lactation. The length of the teat canal, area of the teat end, and wall thickness were measured from the axial picture recorded by ultrasound Aloka SSD500 (Aloka Co., Ltd., Tokyo, Japan).Significant interbreed differences were detected in external as well as internal teat proportions (P<0.05-0.001). Relative changes of teat diameter, comparing C and H cows, differed significantly between the 1st and the 3rd measurement (P<0.05). The length of teat increased during milking and didn´t achieve the beginning size during 3 h after milking. Significant diiference in the length of teat between the 2nd measurement and the 3rd measurement was determined in H cows only (P<0.001). The most significant changes of the length of the teat canal and the area of teat were found in both breeds between values measured closely before and immediately after milking (P<0.5-0.001). Wall thickness was strengthen in C cows (+15.6 %) during the 2nd measurement according to the 1st (P<0.05), while difference represented +18 % (P<0.001) in H cows. Non-significantly higher values of external proportions of teat were measured in the 2nd period of lactation except diameter of teat closely before milking. Internal proportions of teat were always significantly higher in the 2nd period of lactation in relation to the 1st period. Prolongation of teat canal by 0.15 cm (P<0.01) closely before, by 0.16 cm (P<0.001) immediately after, and by 0.13 cm (P<0.01) 3 h after milking was measured in the 2nd period of lactation. The area of teat end measured before milking was significantly larger in the 2nd period of lactation (P<0.01). Keywords

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Section: Resultsmentioning

confidence: 99%

Changes in teat parameters caused by milking and their recovery to their initial size

et al. 2010

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“…For this reason, our simulation was also based on a TMI scenario, so that practical selection can follow the new setup in the near future. For setting up the TMI, EBV for a 305-day milk production (BS SR, 2009), functional length of productive life (Mészáros et al, 2008) and live weight at 210 days of age (Kasarda et al, 2009) were used. As stated by Lin and Allaire (1977), the selection index is inherited.…”

Section: Methodsmentioning

confidence: 99%

“…Kadlečík et al (2004) proposed a change in the breeding goal, expanding the single recording of milk production to include recordings of multiple desirable traits which together serve as a basis for the total merit index proposed by Kasarda et al (2008a). This index includes estimated breeding values (EBV) for milk production in kg (BS SR, 2009), for live weight at 210 days of age (Kasarda et al, 2009), and for functional length of production life (Mészáros et al, 2008). The economic importance of these traits was based on studies by Krupová et al (2009).…”

Section: Introductionmentioning

confidence: 99%

Influence of mating systems and selection intensity on the extent of inbreeding and genetic gain in the Slovak Pinzgau cattle

Kasarda¹,

Mészáros²,

Kadlečík³

et al. 2014

CZECH J ANIM SCI

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ABSTRACT:The aim of the present paper was to simulate the scenarios for a maximum avoidance of inbreeding (MAI) mating strategy, and compare it with a random mating alternative, with the main focus on inbreeding and development of the genetic gain. The parameters of the simulation were based on the structure of the Slovak Pinzgau active population of 2868 animals (930 purebred cows). The selection under a total merit index (TMI) was simulated, covering the milk, survival, and live weight breeding value estimation results. The heritability of TMI (h 2 = 0.09) was estimated using a REML single trait animal model. Alternatives assumed a closed population structure, fixed number of mating per parent, and equal use of sires in insemination. Animals in generation 0 were set as founders without pedigree information. In separate simulation runs, the number of sires of sires was set at 2, 4, 5 or 10 mated with 40 dams of sires in all cases. The sex ratio of the offspring was assumed to be 50/50 male/female. Twenty consecutive generations were simulated for both random and maximum avoidance of inbreeding mating, which resulted in a total of 8 scenarios. Significant positive differences in genetic gain were observed in the MAI mating system with 2 (0.74**), 4 (0.24**), 5 (0.13**) or 10 (0.09**) sires in comparison to random mating design. When using MAI, significantly lower inbreeding was observed with 2 (5.44**), 4 (3.18**), 5 (2.43**) or 10 (1.16**) sires. Simulation results showed that the use of a maximum avoidance of inbreeding mating strategy would lead to significantly decreased rates of inbreeding while maintaining suitable levels of genetic gain in the Slovak Pinzgau population.

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“…Heritability estimates on a log linear scale range from 0.05 to 0.10 (Caraviello et al, 2004b), while on average they range from 0.15 to as high as 0.20 when determined on the original scale (Caraviello et al, 2004a). Using the Weibull PH models, Mészáros et al (2008) reported heritability estimates of 0.05 on a logarithmic scale in Croatian Pinzgau cattle. This concurred with the logarithmic estimates of 0.04 reported earlier by Van der Linde et al (2006) and Chirinos et al (2007).…”

Section: Proportional Hazards Modelsmentioning

confidence: 98%

“…Durr et al, 1999;Caraviello et al, 2004a;Mészáros et al, 2008;M'hamdi et al, 2010;Jovanovic & Raguz, 2011). More than 50% of all member countries of Interbull that evaluate longevity use PH models with sire or sire-maternal grandsire models, although countries such as New Zealand, Ireland, Australia, Great Britain and USA still use the multi-trait animal or sire models (Potocnik et al, 2009;Interbull, 2014).…”

Section: Proportional Hazard Modelsmentioning

confidence: 99%

Genetic Prediction Models and Heritability Estimates for Functional Longevity in Dairy Cattle

Imbayarwo-Chikosi¹,

Dzama²,

Halimani³

et al. 2015

SA J. An. Sci.

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Longevity is a major component of the breeding objective for dairy cattle in many countries because of its high economic value. The trait has been recommended for inclusion in the breeding objective for dairy cattle in South Africa. Linear models, random regression (RR) models, threshold models (TMs) and proportional hazard models (PH) have been used to evaluate longevity. This paper discusses these methodologies and their advantages and disadvantages. Heritability estimates obtained from these models are also reviewed. Linear methodologies can model binary and actual longevity, while RR and TM methodologies model binary survival. PH procedures model the hazard function of a cow at time t derived from survival from first calving to culling, death or censoring. It is difficult to compare methodologies for sire evaluation and ranking across countries because of the variation in the definition of longevity and the choice of model. Sire estimated breeding values (EBVs) are derived differently for the models. Sire EBVs from PH models are expressed as deviations of the culling risk from the mean of the base sires, expected percentage of daughters still alive after a given number of lactations, expected length of productive life in absolute terms or as standard deviation units. In linear, TM and RR modelling, sire EBVs for longevity have been expressed as deviations of survival from the mean estimated with Best Linear Unbiased Prediction (BLUP). Appropriate models should thus be developed to evaluate functional longevity for possible inclusion in the overall breeding objective for South African dairy cattle. ______________________________________________________________________________________

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Genetic evaluation for length of productive life in Slovak Pinzgau cattle

Cited by 29 publications

References 19 publications

Changes in teat parameters caused by milking and their recovery to their initial size

Changes in teat parameters caused by milking and their recovery to their initial size

Influence of mating systems and selection intensity on the extent of inbreeding and genetic gain in the Slovak Pinzgau cattle

Genetic Prediction Models and Heritability Estimates for Functional Longevity in Dairy Cattle

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