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Naslov:Prediction of standard lactation curves for primiparous Holstein cows by using corrected regression models
Avtorji:Jeretina, Janez (Avtor)
Babnik, Drago (Avtor)
Škorjanc, Dejan (Avtor)
Datoteke:.pdf Italian_Journal_of_Animal_Science_2015_Jeretina,_Babnik,_Skorjanc_Prediction_of_Standard_Lactation_Curves_for_Primiparous_Holstein_Cows.pdf (497,85 KB)
 
URL http://www.tandfonline.com/doi/full/10.4081/ijas.2015.3776
 
Jezik:Angleški jezik
Vrsta gradiva:Znanstveno delo (r2)
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:FKBV - Fakulteta za kmetijstvo in biosistemske vede
Opis:Prediction of the expected milk yield is important for the management of the primiparous cows (PPC) with a few or no data on their own milk productivity. We developed a system of regression equations for predicting milk yields in standard lactation. The models include the systematic effects of the calving season, the five-year rolling herd average of milk yield of PPC, the breeding values of the parents for milk production, and daily milk recordings. A total of 21,901 lactations of Holstein PPC were collected during the regular monthly milk recordings of cows in the Republic of Slovenia. By including daily milk recordings in the model, the coefficients of determination of regression models for the prediction of milk yield increase: without known recordings (M0) R 2 =0.80; with one recording (M1) R 2 =0.82; with two first consecutive recordings (M2) R 2 =0.86; and with three recordings (M3) R 2 =0.89. Deviations of milk yield up to 500 kg in a standard lactation (<1.6 kg/day) were as follows: with the model M0, they occurred in 53.4% of PPC; with M1, they occurred in 56.3% of PPC; with M2, they occurred in 64.5% of PPC; and with M3, they occurred in 70.9% of PPC. We concluded that the developed system of regression models is an appropriate method for milk yield prediction of PPC.
Ključne besede:primiparous cows, milk yield, prediction, lactation curves, regression equations
Leto izida:2015
Št. strani:str. 628-633
Številčenje:Letn. 14
ISSN:1594-4077
UDK:636.2:637.1
COBISS_ID:4020524 Povezava se odpre v novem oknu
DOI:10.4081/ijas.2015.3776 Povezava se odpre v novem oknu
ISSN pri članku:1594-4077
Licenca:CC BY-NC 4.0
To delo je dosegljivo pod licenco Creative Commons Priznanje avtorstva-Nekomercialno 4.0 Mednarodna
Število ogledov:67
Število prenosov:1
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Področja:Ostalo
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Skupna ocena:(0 glasov)
Vaša ocena:Ocenjevanje je dovoljeno samo prijavljenim uporabnikom.
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Gradivo je del revije

Naslov:Italian Journal of Animal Science
Skrajšan naslov:Ital. J. Anim. Sci.
Založnik:Taylor & Francis Group
ISSN:1594-4077
COBISS.SI-ID:1544840 Novo okno

Sekundarni jezik

Jezik:Slovenski jezik
Ključne besede:krave prvesnice, mlečni pridelek, napovedovanje, laktacijske krivulje, regresijske enačbe


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