Selection of dairy goats by using lactation curve model

S. Andonov; V. Dzabirski; S. Srbinovska

Selection of dairy goats by using lactation curve model

In: Milking and milk production of dairy sheep and goats

Authors:

S. Andonov

S. Andonov Faculty of Agriculture, P.O. Box 297, 91000 Skopje, Fyrom

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V. Dzabirski

V. Dzabirski Faculty of Agriculture, P.O. Box 297, 91000 Skopje, Fyrom

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, and

S. Srbinovska

S. Srbinovska Faculty of Agriculture, P.O. Box 297, 91000 Skopje, Fyrom

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Type:: Chapter

Pages:: 418–420

DOI:: https://doi.org/10.1163/9789004683877_086

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Summary

Changes in daily milk yields during lactation, environmental factors influencing lactation, and possibilities for fitting lactation curve with a non-linear model were investigated in 259 lactations in 120 dairy goats of local population (Saanen type), during a period of 3 years (1993-95). In the first two years (1993-94), milk controls were taken by using the A4 method for 7 months, beginning after the suckling period (60 days). In 1995, a control system began at 10 days after kidding, every 10 days during 9 months. Four non-linear models of lactation curves were fitted (Wood’s model, the model of Cobby & Le Du, 4 parameters Morant and two phases function), by the quasi Newton algorithm.

The best fit was obtained by the Wood equation (R² = 89.429), while the Morant, the Cobby & Le Du and the two phases function models achieved R² = 83.263%, 76.715% and 20.754%, respectively. The highest daily milk yield (994.18kg) was recorded 136.82 days after parturition, and the persistency index was S = 15.23. The influence of the year and parity was highly significant (p<0.01) with regard to the level of production, represented by the scalar values of parameter a in the Wood equation. The other two parameters were not significantly (p>0.05) influenced by environmental factors.

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Milking and milk production of dairy sheep and goats

E-Book ISBN:: 9789004683877

Publisher:: Wageningen Academic

Print Publication Date:: 01 Jan 1999

Subjects
- Life Sciences
  - General
  - Animal & Veterinary

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Selection of dairy goats by using lactation curve model

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Milking and milk production of dairy sheep and goats

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