Estimation of some productive and reproductive effects on longevity of beef cows using survival analysis

Szabó, Ferenc; Dákay, Ildikó

doi:10.1016/j.livsci.2008.09.024

Cited by 19 publications

(20 citation statements)

References 19 publications

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“…A relevant effect was also found regarding the season of parity, a higher ability to survive was detected for cows that calve in spring, as reported previously by Szabo and Dakay (2009). In addition, and as illustrated in Figure 3, SURV is reduced in older cows.…”

Section: Survsupporting

confidence: 84%

“…The results for the posterior mean estimates of the systematic effects for survival shown in Table 4 indicate that ability to reach the following calving is reduced when the cow has a male calf and when some kind of veterinary assistance is required in calving, confirming the results of Kocak et al (2007) and Szabo and Dakay (2009). A relevant effect was also found regarding the season of parity, a higher ability to survive was detected for cows that calve in spring, as reported previously by Szabo and Dakay (2009).…”

Section: Survsupporting

confidence: 80%

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Genetic correlation of longevity with growth, post-mortem, docility and some morphological traits in the Pirenaica beef cattle breed

Varona

Moreno

Altarriba

2012

Animal

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Survival or longevity is an economically relevant trait in cattle. However, it is not currently included in cattle selection criteria because of the delayed recording of phenotypic data and the high computational demand of survival techniques under proportional hazard models. The identification of longevity-correlated traits that can be early registered in lifetime would therefore be very useful for beef cattle selection processes. The aim of this study was to estimate the genetic correlation of survival (SURV) with: growth -birth weight (BW), weight at 120 days (W120), weight at 210 days (W210); carcass -cold carcass weight (CCW), conformation (CON), fatness (FAT) and meat colour (COL); teat morphology -teat thickness (TT), teat length (TL) and udder depth (UD); leg morphology -forward (FL) and backward legs (BL); milk production (MILK) and docility (DOC). In the statistical analysis, SURV was measured in discrete-time intervals and modelled via a sequential threshold model. A series of independent bivariate Bayesian analyses between cow survival and each recorded trait were carried out. The posterior mean estimates (and posterior standard deviation) for the heritability of SURV was 0.05 (0.01); and for the relevant genetic correlations with SURV were 0.07 (0.04), 0.12 (0.05), 0.10 (0.05), 0.15 (0.05), 20.18 (0.06), 0.33 (0.06) and 0.27 (0.15) for BW, W120, W210, CCW, CON, FAT and COL, respectively.

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Section: Survsupporting

confidence: 84%

Section: Survsupporting

confidence: 80%

Genetic correlation of longevity with growth, post-mortem, docility and some morphological traits in the Pirenaica beef cattle breed

Varona

Moreno

Altarriba

2012

Animal

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“…Breed differences in length of productive life have been reported in beef cattle in Hungary (Dákay et al 2006;Szabó and Dákay 2009). In the USA, Núñez-Dominguez et al (1991, 1992) indicate a greater advantage of crossbred (Bos taurus × Bos indicus) cows for meat, survival, and longevity than purebred cows of European origin.…”

Section: Discussionmentioning

confidence: 99%

“…Productive life of a cow is the result of their reproductive performance, maternal ability, health and their survivability, and that of the calf; therefore, it expresses its aptitude in the herd (Martinez et al 2004;Szabó and Dákay 2009). A longer length of productive life substantially decreases replacement costs and enables the achievement of maximum performance in the herd by having more adult cows, which increases the number of calvings, produces heavier calves at weaning, and increases the total amount of meat produced (Martinez et al 2004;Rogers et al 2004, Szabó andDákay 2009).…”

Section: Introductionmentioning

confidence: 99%

“…A longer length of productive life substantially decreases replacement costs and enables the achievement of maximum performance in the herd by having more adult cows, which increases the number of calvings, produces heavier calves at weaning, and increases the total amount of meat produced (Martinez et al 2004;Rogers et al 2004, Szabó andDákay 2009). The productivity of a cow defined as the total weight of weaned calves during its life could be the most important component to measure its efficiency and productivity (Núñez-Dominguez et al 1991;Martinez et al 2004).…”

Section: Introductionmentioning

confidence: 99%

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Effects of breed type and age at first calving on length of productive life in a cow–calf system in Southeastern Mexico

Aranda-Ávila

Magaña-Monforte

Segura-Correa

2010

Trop Anim Health Prod

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The effect of age at first calving (AFC) and breed type (BG) on cow length of productive life in the herd (LPL) and cumulative kilograms of calves weaned per cow (KWC) was studied. Data on 313 Brahman, 183 Nellore, and 269 crossbred cows (undefined crosses of European × Zebu cattle) born from 1986 to 2002 were used. Three hundred and ninety-one out of the 765 cows had non-censored data. LPL curves by BG and AFC (<2.5, 2.5 to <3, 3 to <3.5, and ≥ 3.5 years of age) were obtained using life table procedures. The magnitude of the effect of AFC and BG on LPL was determined using Cox proportional hazard regression procedures. KWC data (n=359) were analyzed by a linear model that included the effects of period of birth of the cow (in years), BG, and AFC. There was no difference in the survival curves between BG (p>0.05), but there was for the hazard ratio of culling (p<0.05). Brahman and Nellore cows produced more kilograms of calves (p<0.05) than crossbred cows. AFC influenced LPL (p=0.014) and KWC (p=0.012). Cows with AFC <3 years of age stayed longer in the herd and weaned more KWC than those with a higher AFC (p<0.05).

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Limitations and potentials of dual-purpose cow herds in Central Coastal Veracruz, Mexico

Absalon-Medina

Blake

Fox

et al. 2011

Trop Anim Health Prod

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Feed chemical and kinetic composition and animal performance information was used to evaluate productivity limitations and potentials of dual-purpose member herds of the Genesis farmer organization of central coastal Veracruz, Mexico. The Cornell Net Carbohydrate and Protein System model (Version 6.0) was systematically applied to specific groups of cows in structured simulations to establish probable input–output relationships for typical management, and to estimate probable outcomes from alternative management based on forage-based dietary improvements. Key herd vulnerabilities were pinpointed: chronic energy deficits among dry cows of all ages in late gestation and impeded growth for immature cows. Regardless of the forage season of calving, most cows, if not all, incur energy deficits in the final trimester of gestation; thus reducing the pool of tissue energy and constraining milking performance. Under typical management, cows are smaller and underweight for their age, which limits feed intake capacity, milk production and the probability of early postpartum return to ovarian cyclicity. The substitution of good-quality harvested forage for grazing increased predicted yields by about one-third over typical scenarios for underweight cows. When diets from first parturition properly supported growth and tissue repletion, milk production in second and third lactations was predicted to improve about 60%. Judiciously supplemented diets based on good quality grass and legume forages from first calving were predicted to further increase productivity by about 80% across a three-lactation cow lifetime. These dual-purpose herd owners have large incentives to increase sales income by implementing nutritional strategies like those considered in this study.

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Estimation of some productive and reproductive effects on longevity of beef cows using survival analysis

Cited by 19 publications

References 19 publications

Genetic correlation of longevity with growth, post-mortem, docility and some morphological traits in the Pirenaica beef cattle breed

Genetic correlation of longevity with growth, post-mortem, docility and some morphological traits in the Pirenaica beef cattle breed

Effects of breed type and age at first calving on length of productive life in a cow–calf system in Southeastern Mexico

Limitations and potentials of dual-purpose cow herds in Central Coastal Veracruz, Mexico

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