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| Smyth, Paul; Harte, Laurence; Hennessy, Thia C.. |
| This paper examines the relationship between calving date and production costs on Irish dairy farms from 2000-2007. Using data from the National Farm Survey, the median calving dates of 400 dairy farms are studied each year using econometric analysis to determine the relationship between calving date and production costs. Farms are divided into five categories according to their median calving date. These categories are imputed into a panel dataset as dummy variables. Unobservable individual effects are controlled for using a fixed effect model; examples of such effects are land quality and managerial ability, Results suggest that when scale and those unobserved effects are controlled for, there was no significant difference in total cost of production per... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Seasonality; Fixed effect; Calving date; Production Economics. |
| Ano: 2009 |
URL: http://purl.umn.edu/51076 |
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| Reinher,Cristiane; Barcellos,Júlio Otávio Jardim; Peripolli,Vanessa; Prates,Ênio Rosa; Canozzi,Maria Eugênia Andrighetto. |
| It was evaluated in this work the effect of calving sub-season on the pregnancy rate of 7,726 multiparous Hereford beef cows grazing on natural pastures in southern Brazil, from 1994 to 2007. Calving sub-season periods were divided in 20-day intervals from August 12th to 31st; from September 1st to 20th; from September 21st to October 10th; from October 11th to 31st; from November 1st to 20th. Calving in each sub-season and pregnancy rate (PR) were analyzed by the Chi-square test. Overall means of each sub-season were 92.7% (from August 12th to 31st), 90.6% (from September 1st to 20th), 82.1% (from September 21st to October 10th), 77.7% (from October 11th to 31st), and 70.6% (from November 1st to 20th). Calving sub-season significantly influenced pregnancy... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Calving date; Cow-calf; Multiparous; Pregnancy rate. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010001000012 |
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