بررسی زیان اقتصادی ناشی از تأخیر در آبستنی گاوهای شیری

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری گروه علوم دامی، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج

2 استادیار گروه علوم دامی، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج

3 استادیار گروه علوم دامی، دانشگاه علوم کشاورزی و منابع طبیعی دانشگاه ساری

چکیده

هدف از مطالعۀ حاضر، بررسی آثار اقتصادی تأخیر آبستنی گاوهای شیری در گاوداری‌های بزرگ صنعتی ایران است. روزهای باز بهینه و حداکثر تولید به ترتیب 110 روز و 45 کیلوگرم در نظر گرفته شد. قیمت شیر، هزینۀ اقلام خوراکی، اسپرم و هورمون‌ها بر اساس متوسط قیمت پاییز 1393 شناسایی شد. با افزایش روزهای باز از 110 به 170 روز هزینۀ اسپرم مصرفی و هورمون لازم برای آبستن‌کردن دام 2 برابر شد. نتایج این پژوهش نشان داد برای گاوی با حداکثر تولید 45 کیلوگرم، هرروز تأخیر در آبستنی در اولین، دومین، سومین و چهارمین‌ماه پس از روز 110، به ترتیب 254005، 511612، 725957 و 1013331 ریال زیان اقتصادی ایجاد خواهد کرد. 2/55 تا 8/57 درصد این زیان ناشی از هزینه‌های خوراک است؛ هر 1 درصد تغییر در قیمت خوراک، این زیان را به‌طور مستقیم 56/0درصد تغییر خواهد داد.

کلیدواژه‌ها


عنوان مقاله [English]

Evaluating Economic Losses Associated With Delayed Conception in Dairy Cows

نویسندگان [English]

  • Ali Rezaee Roodbari 1
  • Hamid Kohram 2
  • Essa Dirandeh 3
1 Ph. D. Student, Department of Animal Science, University College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran
2 Assistant Professor, Department of Animal Science, University College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran
3 Assistant Professor, Department of Animal Science, Sari Agricultural & Natural Resources University
چکیده [English]

The objective of this study was to consider economic consequence of delayed conception of milking cows in large dairy farms in Iran. Optimum open days and milk production at peak were assumed to be 110 days and 45 kg respectively. Price of milk, feed, semen and hormones were calculated based on average prices of autumn, 2013. Results of this study showed that increasing days in milk (DIM) from 110 to 170 has doubled costs of sperm and veterinary hormones. Delaying of each day of conception in cows with 45 kg of milk production at peak, during first; second, third and fourth estrous cycle beyond the optimum days open (110 d) cause economic losses of 308503, 572818, 812689 and 1013331 Rials, respectively. Feed costs compromise 54.7 to 56.6 percent of the loss, and any one percent change in feed price will directly cause 0.55 percent changes of the loss.

کلیدواژه‌ها [English]

  • economic evaluation
  • open days
  • feed costs
  1. Arbel, R., Bigun,Y., Ezra, E., Sturman, H. & Hojman, D.(2001). The effect of extended calving intervals in high lactating cows on milk production and profitability. Journal of Dairy Science, 84, 600-608.
  2. Bellows, D.S., Ott, S.L. & Bellows, R.A. (2002). Cost of reproductive diseases and conditions in cattle. The Prof. Animal Science, 18, 26-32.
  3. Boichard, D. (1990). Estimation of the economic value of conception rate in dairy cattle. Livestock Production Science, 24, 187-204.
  4. De Vries, A. & Conlin, B.J. (2003). Economic value of timely determination of unexpected decreases in detection of estrus using control charts. Journal of Dairy Science, 86, 3516-3526.
  5. De Vries, A. (2006). Economic value of pregnancy in dairy cattle. Journal of Dairy Science 89:3876–3885.
  6. Dobson, H., Smith, R.F., Royal, M.D., Knight, C.H. & Sheldon, I.M. (2007). The High-producing dairy cow and its reproductive performance. Reproduction Domestic Animal, 42 (Suppl.2), 17-23.
  7. Dekkers, J.C.M., Ten Hag, J.H. &Weersink A. (1998). Economic aspects of persistency of lactation in dairy cattle. Livestock Production Science, 53, 237-252.
  8. Esslemont, R.J., Kossaibati, M.A. & Allock, J. (2000). Economics in fertility in dairy cows. Fertility in high producing dairy cows. Occasional publication No.26. British Society of Animal Science. PP. 19-28.
  9. French, P. D. & Nebel, R.L. (2003). The simulated economic cost of extended calving intervals in dairy herds and comparison of reproductive management programs. Journal of Dairy Science, 86 (Suppl. 1), 54 (abstract).
  10. Hare, E., Norman, H.D. & Wright, J.R. (2006). Trends in calving ages and calving intervals for dairy cattle breed in the United States. Journal of Dairy Science, 89, 365-370.
  11. Holmann, F. J., Shumway, C.R., Blake, R.W., Schwart, R.B. & Sudweeks, E.M. (1984). Economic value of days open for Holstein cows of alternative milk yields with varying calving intervals. Journal of Dairy Science, 67, 636-643.
  12. 12.    Hutjens, M.F. (2005). Dairy efficiency and dry matter intake. Proceedings of the 7th Western Dairy Management Conference.
  13. Inchaisria, C., Jorritsma, R., Vos, P.L.A.M., van der Weijdena, G.C. & Hogeveen, H. (2010). Economic consequences of reproductive performance in dairy cattle. Theriogenology, 74, 835-846.
  14. Kafi, M., Zibaei, M. & Rahbari, A. (2007). Accuracy of estrous detection in cows and its economic impacts on Shiraz dairy farms. Iranian.Journal of Vetrinary Research, 8 (2), 131-137.
  15. Knight, C.H. (2001). Lactation and gestation in dairy cows: flexibility avoids nutritional extremes. Proceeding Nutrition Society, 60, 527-537.
  16. Linn, J. (2006). Feed efficiency: Its economic impact in lactating dairy cows. WCDS Advances in Dairy Technology, 18, 19-28.
  17. Meadows, C., Rajala-Schultz, P.J. & Frazer, G.S. (2005). A Spreadsheet-based model demonstrating the nonuniform economic effects of varying reproductive performance in Ohio dairy herds. Journal of Dairy Science, 88, 1244-1254.
  18. Moore, K. & Thatcher, W.W. (2006). Major advances associated with reproduction in dairy cattle. Journal of Dairy Science, 89, 1254-1266.
  19. Mulligan, F.J., O’Grady, L., Rice, D.A.&Doherty, M.L. (2006). A herd health approach to dairy cow nutrition and production diseases of the transition cow. Animal Reproduction Science, 96, 331-353.
  20. Pasman, E.J. (1994). The development of control prediction system for milk yield and mastitis from field data. Ph.D. Tesis. Department of Agriculture. The University of Reading, UK.
  21. Plaizier, J. C. B., King, G.J., Dekkers, J.C.M. & Lissemore, K. (1997). Estimation of economic values of indices for reproductive performance in dairy herds using computer simulation. Journal of Dairy Science, 80, 2775-2783.
  22. Pryce, J.E., Royal, M.D., Garnsworthy, P.C. & Mao, I.L. (2004). Fertility in the high-producing dairy cow. Livestock Production Science, 86, 125-135.
  23. Roche, J.F. (2006). The effect of nutritional management of the dairy cow on reproductive efficiency. Animal Reproduction Science, 96, 282-296.