COMPARISON AND EVALUATION OF SOME MATHEMATICAL FUNCTIONS IN DESCRIBINGTHE LACTATION CURVE OF IRANIAN DAIRY CATTLE

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ARIANFAR MARYAM; ROKOUEI MOHAMMAD; DASHAB GHOLAM REZA; FARAJI AROUGH HADI

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Journal: Journal of Animal Production Year:2018 | Volume:20 | Issue:3 Page(s): 351-362

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Title

COMPARISON AND EVALUATION OF SOME MATHEMATICAL FUNCTIONS IN DESCRIBINGTHE LACTATION CURVE OF IRANIAN DAIRY CATTLE

Author(s)

ARIANFAR MARYAM | ROKOUEI MOHAMMAD | DASHAB GHOLAM REZA | FARAJI AROUGH HADI | Issue Writer Certificate

Keywords

IRANIAN HOLSTEINQ2

MATHEMATICAL FUNCTIONQ2

MILK PRODUCTIONQ1

TEST DAY RECORDQ3

Abstract

The objective of this study was to compare some nonlinear functions (Wood, Dhanoa, Wilmink, Ali-Schaeffer, Cappio Borlino, Cobby – Le Du, Dijkstra, Rook, Gous and Nelder) to describe the MILK PRODUCTION curve of IranianHolstein cattle. A dataset consisted of 6079976, 4879486 and 3312416 test-day milk yield records related to first, second and third three lactation periods, respectively, from 3550 herds collecting by the Animal Breeding Center ofIran from 1983 to 2017, were used. The average of test day milk records for three lactation was 31. 17, 34. 08 and33. 83 kg, respectively. The nlme package of R software (version 3. 4. 3) was used for fitting nonlinear functions. Thenonlinear functions were compared using four goodness of fit criteria, including Akaike’ s information criterion(AIC), Bayesian information criterion (BIC), Root mean square error (RMSE) and Durbin-Watson index (DW). TheRook function showed the best fit for the MILK PRODUCTION curve shape for three lactations in IRANIAN HOLSTEIN cattlewhen compared to other functions. The Gous and Rook functions showed the highest accuracy in predicting peaktime, peak yield and persistency of MILK PRODUCTION parameters in different lactations, but in general, the Rookfunction has a high predictive value in estimating the milk curve parameter descriptors. Therefore, Rook function isrecommended for describing the MILK PRODUCTION curve of IRANIAN HOLSTEIN cattle.

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APA: Copy

ARIANFAR, MARYAM, ROKOUEI, MOHAMMAD, DASHAB, GHOLAM REZA, & FARAJI AROUGH, HADI. (2018). COMPARISON AND EVALUATION OF SOME MATHEMATICAL FUNCTIONS IN DESCRIBINGTHE LACTATION CURVE OF IRANIAN DAIRY CATTLE. JOURNAL OF ANIMAL PRODUCTION (JOURNAL OF AGRICULTURE), 20(3 ), 351-362. SID. https://sid.ir/paper/209102/en

Vancouver: Copy

ARIANFAR MARYAM, ROKOUEI MOHAMMAD, DASHAB GHOLAM REZA, FARAJI AROUGH HADI. COMPARISON AND EVALUATION OF SOME MATHEMATICAL FUNCTIONS IN DESCRIBINGTHE LACTATION CURVE OF IRANIAN DAIRY CATTLE. JOURNAL OF ANIMAL PRODUCTION (JOURNAL OF AGRICULTURE)[Internet]. 2018;20(3 ):351-362. Available from: https://sid.ir/paper/209102/en

IEEE: Copy

MARYAM ARIANFAR, MOHAMMAD ROKOUEI, GHOLAM REZA DASHAB, and HADI FARAJI AROUGH, “COMPARISON AND EVALUATION OF SOME MATHEMATICAL FUNCTIONS IN DESCRIBINGTHE LACTATION CURVE OF IRANIAN DAIRY CATTLE,” JOURNAL OF ANIMAL PRODUCTION (JOURNAL OF AGRICULTURE), vol. 20, no. 3 , pp. 351–362, 2018, [Online]. Available: https://sid.ir/paper/209102/en

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