Acta Univ. Agric. Silvic. Mendelianae Brun. 2012, 60, 103-110

https://doi.org/10.11118/actaun201260060103
Published online 2013-07-19

Innovation of prediction equations for milk composition estimation in milk recording at alternative sampling and half a day milking interval

Oto Hanuš1, Pavel Hering2, Petr Roubal1, Gustav Chládek3, Aleš Dufek4, Radoslava Jedelská5, Marcela Vyletělová1, Jiří Höfer1

1Výzkumný ústav mlékárenský, Praha, Dairy Research Institute, Prague, Ke Dvoru 12a, 160 00 Praha 6 – Vokovice, Česká republika, The Czech Republic
2Českomoravská společnost chovatelů, a. s., Laboratoř pro rozbory mléka Buštěhrad, Czech Moravia Breeders Association (CMBA), Laboratory for milk analyses Buštěhrad, Lidická 2/334, 273 43 Buštěhrad, Česká republika, The Czech Republic,
3Ústav chovu a šlechtění zvířat, Agronomická fakulta, Mendelova univerzita v Brně, Department of Animal Breeding, Agronomical faculty, Mendel’s Univeristy in Brno, Zemědělská 1, 613 00 Brno, Česká republika, The Czech Republic
4Agrovýzkum Rapotín, AgriResearch Rapotín, Výzkumníků 267, 788 13 Vikýřovice, Česká republika, The Czech Republic
5Výzkumný ústav pro chov skotu Rapotín, Research Institute for Cattle Breeding Rapotín, Výzkumníků 267, 788 13 Vikýřovice, Česká republika, The Czech Republic

At dairying cost reduction and effort about maintenance of milk recording (MR) range the MR cost decrease is also important. Aim was to revise the older prediction equations for alternative reduced milk sampling (morning – M or evening – E) for assurance of MR reliable results at twice milking a day (TMD) with balanced interval 12/12. Individual milk samples (n = 619 animals) were obtained during TMD (M, E and REF; n = 1 857 samples). Fat (F), protein (P), lactose (L) and somatic cell count (SCC) were analysed. Czech Fleckvieh and Holstein breeds were included. The reference values (REF) of day milking were obtained in regular MR (A4P). M and E milking results were related to the REF. Older prediction equations with lower validity because of time and breeding were revised: a) for F from M on REF y = 0.6932x + 1.381, where r = 0.752 and P ≤ 0.001; b) for P from M on REF y = 0.9432x + 0.2274, where r = 0.949 and P ≤ 0.001; c) for L from E on REF y = 0.8145x + 0.9095, where r = 0.87 and P ≤ 0.001; d) for log SCC from E on REF y = 0.8829x + 0.2367, where r = 0.94 and P ≤ 0.001. MR cost reduction is possible using method of alternative sampling including corresponding prediction equations.

References

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