Fitness for transport of cull dairy cows at livestock markets
| Autor: | J. Stojkov, M.A.G. von Keyserlingk, David Fraser, Todd F. Duffield |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Farms
Transportation Culling Biology Animal Welfare Logistic regression Odds 03 medical and health sciences Health problems Animal science Genetics medicine Animals Udder health care economics and organizations 030304 developmental biology 0303 health sciences British Columbia business.industry Commerce 0402 animal and dairy science food and beverages 04 agricultural and veterinary sciences Odds ratio 040201 dairy & animal science Confidence interval Dairying Milk medicine.anatomical_structure Physical Fitness Cattle Female Animal Science and Zoology Livestock Seasons business Food Science |
| Zdroj: | Journal of Dairy Science. 103:2650-2661 |
| ISSN: | 0022-0302 |
| DOI: | 10.3168/jds.2019-17454 |
| Popis: | Cows are regularly removed from dairy herds and sold at livestock markets. Many cows are removed because of health problems, and their fitness for transport may vary because of seasonal variation, delayed or poor on-farm culling decisions, injuries during transport, and other factors. However, many dairy producers lack feedback about the condition of their cows during the marketing process and how cow condition influences sale price. This study evaluated the condition of cull dairy cows sold at livestock markets, tested how changing demand for milk influenced fitness for transport, and quantified how cow condition affected the price paid. For 12 mo, 2 livestock markets in British Columbia, Canada, were visited during 137 auction events when cull dairy cows were sold; 3 trained assessors observed 6,263 cull dairy cows while they were marketed in a sale ring. Observers recorded the cows' body condition score (BCS), locomotion score (LS), udder condition, quality defects (e.g., injuries, illness), and price. Logistic regression was used to test how month-to-month changes in demand for milk affected cows' fitness for transport, and a linear mixed model assessed how the animals' condition influenced the price. About 10% of the cows were thin (BCS ≤2), 7% were severely lame (locomotion score ≥4), 13% had engorged or inflamed udders, and 6% had other quality defects including abscesses, injuries, and signs of sickness (e.g., pneumonia). Cows culled during months with increased milk demand had much higher odds of poor fitness for transport (odds ratio 8.6, 95% confidence interval: 4.02-18.22). The price was most reduced if cows were thin (BCS ≤2) or visibly sick (-$0.63 ± 0.01/kg and -$0.56 ± 0.02/kg, respectively). Prices were reduced to a lesser degree by locomotion score ≥4 (-$0.35 ± 0.02/kg) and by udder condition (udder inflammation; -$0.30 ± 0.02/kg). Overall fitness for transport reduced the price by $0.51 ± 0.01/kg. In summary, about 30% of the cows sold at livestock markets had poor fitness for transport, which was partially influenced by increased milk demand and resulted in reduced market prices. |
| Databáze: | OpenAIRE |
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