JOURNAL BROWSE
Search
Advanced SearchSearch Tips
Optimum Model for Analyzing Lifetime Profitability of Holstein Cows
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
 Title & Authors
Optimum Model for Analyzing Lifetime Profitability of Holstein Cows
Shadparvar, A.A.; Nikbin, S.;
  PDF(new window)
 Abstract
This study was on the relative net income (RNI) for 18,286 Iranian Holstein cows from 799 herds, with first freshening between 1991 and 2000. Two kinds of production system, which differed mainly in milk pricing system and feed cost, were considered. Four different models adopted from the literature were examined to find the optimum model. They differed by the cost of rearing and growth after first calving and they needed different amounts of economic data at the farm level. Results showed that four measures of RNI were highly correlated (>0.96) and could be used equally to measure lifetime profitability of cows. Therefore, in herds without a regular system for recording economic and management data, use of the simplest model is recommended. Multiple regression analysis revealed that RNI was affected by age at first freshening, milk yield and days of productive life (DPL), regardless of production system, and a similar breeding goal could be defined for the two systems. Multiple regression analysis of RNI showed that in order to obtain an unbiased estimate of economic value for DPL, the per day milk yield, not total lifetime milk yield, should be included in the regression model along with DPL. Regression analysis suggested that it is possible to predict RNI using information on age at first freshening along with the length of first lactation and per day milk yield with a coefficient of determination ranging from 0.44 to 0.47.
 Keywords
Relative Net Income;Regression Analysis;Iranian Holstein;
 Language
English
 Cited by
 References
1.
Balaine, D. S., R. E. Pearson and R. H. Miller. 1981. Profit functions in dairy cattle and effect of measures of efficiency and prices. J. Dairy Sci. 64:87-95. crossref(new window)

2.
Beaudry, T. F., B. G. Cassell and H. D. Norman. 1988a. Relationships of lifetime profit to sire evaluations from first, all, and later records. J. Dairy Sci. 71:204-213. crossref(new window)

3.
Beaudry, T. F., B. G. Cassell, H. D. Norman and R. E. Pearson. 1988b. Impact of prices on profit functions in dairy cattle. J. Dairy Sci. 71:485-491. crossref(new window)

4.
Cassell, B. G., R. E. Pearson, J. Stole and S. Hiemstra. 1990. Relationship between sire evaluation for linear type traits and lifetime relative net income from grade or registered daughters. J. Dairy Sci. 73:198-204. crossref(new window)

5.
Cassell, B. G. and D. J. Weigel. 1994. Use of lifetime net income in dairy genetics research. In: Proceedings of the 5th World Congress on Genetics Applied to Livestock Production, Guelph. 17:97-100.

6.
Cassell, B. G., S. M. Jobst, M. L. Mc Gilliard and R. E. Pearson. 2002. Evaluating sire selection practices using lifetime net income functions. J. Dairy Sci. 85:3492-3502 crossref(new window)

7.
Cassell, B. G., S. M. Smith and R. E. Pearson. 1993. Influence of herd-life opportunity and characteristics of cows and herds on different net income functions. J. Dairy Sci. 76:1182-1190. crossref(new window)

8.
de Hann, M. H. A., B. G. Cassell, R. E. Pearson and B. B. Smith. 1992. Relationship between net income, days of productive life, production, and linear type traits in grade and registered Holsteins. J. Dairy Sci. 75:3553-3561 crossref(new window)

9.
Farahany Poor, M. 2004. Estimation of genetic parameters of relative net income corrected for opportunity cost in Iranian Holstein. MS Thesis. Guilan Univ., Rasht, Iran.

10.
Groen, A. F. 1989. Cattle breeding goals and production circumstances. Ph. D. Thesis. Wageningen Agricultural University. Wageningen, The Netherlands.

11.
Mehdizadeh, E. K. M. 2002. Relationship between lifetime relative net income and first lactation traits in three dairy farms in north of Iran. MS Thesis. Zanjan Univ., Zanjan, Iran.

12.
Nilfrooshan M. A. and M. E. Edriss. 2004 Effect of age at first calving on some productive and longevity traits in Iranian Holsteins of the Isfahan Province. J. Dairy Sci. 87:2130-2135. crossref(new window)

13.
Norman, H. D., B. G. Cassell, R. E. Pearson and G. R. Wiggans. 1981. Relation of first lactation production and conformation to lifetime performance and profitability in Jerseys. J. Dairy Sci. 64:104-113. crossref(new window)

14.
Park, B. and D. Lee. 2006. Prediction of future milk yield with random regression model using test-day records in Holstein cows. Asian-Aust. J. Anim. Sci. 19:915-921

15.
SAS system for windows. 2002. Release 8.02. SAS Institute Inc. NC. USA.

16.
Shadparvar, A. A. 1999. Relationship between relative net income and age at first freshening and milk production of first lactation of dairy cows. J. Agric. Sci. Technol. 13:119-130.

17.
Stokes, J. R., P. R. Tozer and J. Hyde. 2007. Identifying efficient dairy producers using data envelopment analysis. J. Dairy Sci. 90:2555-2562. crossref(new window)

18.
Tigges, R. J., R. E. Pearson and W. E. Vinson. 1984. Use of dairy herd improvement variables to predict lifetime profitability. J. Dairy Sci. 67:180-184. crossref(new window)

19.
Tigges, R. J., R. E. Pearson and W. E. Vinson. 1986. Prediction of lifetime relative net income from first lactation production and individual type traits in Hlostein cows. J. Dairy Sci. 69:204-210. crossref(new window)

20.
Van Arendonk, J. A. M. 1991. Use of profit equations to determine relative economic value of dairy cattle herd life and production from field data. J. Dairy Sci. 74:1101-1107. crossref(new window)

21.
Weigel, D. J., B. G. Cassell and R. E. Pearson. 1995. Adjustment of a net income function for opportunity cost of postponed replacement on a lactation basis. J. Dairy Sci. 78:648-654. crossref(new window)