Factors Influencing Peri- and Early Postnatal Calf Mortality

Laster, D. B.; Gregory, K. E.

doi:10.2527/jas1973.3751092x

Cited by 113 publications

(59 citation statements)

References 4 publications

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“…This is in agreement with estimates reported by Notter et al (19781, Morris et al (1986), and Gregory et al (1991). Dystocia and its effect on calf mortality were studied by Laster and Gregory (1973). They found that the calf was four times as likely to die if the cow experienced dystocia as if she did not.…”

Section: Discussionsupporting

confidence: 89%

Environmental effects on neonatal mortality of beef calves

Azzam

Kinder

Nielsen

et al. 1993

Journal of Animal Science

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ABSTWCT:Calving records from 1969 to 1989 from the Roman L. Hruska U.S. Meat Animal Research Center were used to investigate how climatic conditions, in addition to dystocia, age of dam, size of calf, and sex affect calf survival from birth to 1 wk of age. Data were analyzed separately for cows calving with ( n = 11,094) or without ( n = 72,187) dystocia. Neonatal mortality was described by a logit model and parameters were estimated by maximum-likelihood procedures. Calves born to cows with dystocia were five times as likely to die neonatally than calves born without assistance. Of all calves that died, 43.6% were born with difficulty. Of these calves, survival was lowest for those that were small relative to their genetic group, sex, and age of dam. Large calves had markedly increased mortality only when born to 2-yr-old dams. Average ambient temperature and precipitation on day of calving affected survival nonlinearly and the magnitude of the effect depended on age of dam, sex and size of calf, and dystocia incidence. Calves born to 2-yr-old cows were more susceptible to severe weather conditions than calves born to older cows. The negative effect of precipitation on survival increased with decreasing temperature.

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Section: Discussionsupporting

confidence: 89%

Environmental effects on neonatal mortality of beef calves

Azzam

Kinder

Nielsen

et al. 1993

Journal of Animal Science

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“…Heterosis has been shown to increase birth live-weight, reduce calving difficulty and increase milk yield (Laster and Gregory, 1973;Holland and Odde, 1992;McGee et al, 2005). When live-weight was added to the model the association between heterosis and price remained significant indicating that factors other than live-weight were responsible for the increase in price with increased heterosis.…”

Section: Seasonal Effectsmentioning

confidence: 99%

Factors associated with selling price of cattle at livestock marts

Hugh

Fahey

Evans

et al. 2010

Animal

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The objective of this study was to determine the factors associated with selling price of animals at livestock marts around Ireland. Data consisted of four distinct maturity categories: calves (2 to 84 days of age, n 5 53 838); weanlings (6 to 12 months of age, n 5 19 972); post-weanlings (12 to 36 months of age, n 5 93 081) and cows (.30 months to 12 years of age, n 5 94 839); sold through livestock marts between 2000 and 2008. Factors associated with animal price were determined within each maturity category separately using mixed models; random effects were mart, date of sale nested within mart, and herd of origin nested within year of sale. Mean selling price was h157, h580, h655 and h592 for calves, weanlings, post-weanlings and cows, respectively. The greatest prices were paid for singleton crossbred male calves, weanlings and post-weanlings from older dams. With the exception of the Aberdeen Angus, beef breeds and their crosses consistently received higher prices than their dairy counterparts across all four maturity categories; increased proportion of Belgian Blue and Charolais was associated with greater prices compared with other beef breeds. When live-weight was included in the multiple regression models the association between price and all factors regressed toward zero but most factors remained associated with price. The highest price was recorded in the spring months for calves, post-weanlings and cows, and in the autumn months for weanlings. Results from this study may be used to help farmers make more informed management decisions, as well as provide information for bio-economic models for evaluating alternative production systems or estimating economic values.

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“…in Charolais breeds (Laster and Gregory 1973;Philipsson 1976;Menissier 1919).In 2-yr-old Charolais heifers, surgical removal is performed in 43% of difficult parturition cases (Menissier 1979 (Philipsson 1976), and 19.8 vs. 4.4% in Charolais heifers (Menissier 1979 (Vallet 1983 were described in a previous paper (Vermorel et al 1988). The calves were taken immediately after birth and wiped off with straw.…”

mentioning

confidence: 99%