Vpliv števila somatskih celic na odstotek maščobe in beljakovin v mleku holštajnskih krav v različnih zaporednih laktacijah in v različnih stadijih laktacije

Arash CHEGINI, Navid GHAVI HOSSEIN-ZADEH, Hossein HOSSEINI-MOGHADAM, Abdol Ahad SHADPARVAR

Povzetek


Namen te raziskave je bil proučiti učinek števila somatskih celic (SCS) na vsebnost mlečne maščobe in beljakovin v različnih laktacijah in v različnih fazah laktacije pri iranskih kravah holštajnske pasme. Uporablili smo podatke za 208.478 krav v prvi do deveti laktaciji iz 845 čred, ki so vsebovali 2.456.303 zapisov za mesečni testni dan (TD). Analiza je bila opravljena s proceduro MIXED s ponovljenimi meritvami v programskem paketu SAS. Fiksni vplivi v modelu so bili čreda, leto-sezona telitve, mesec testnega dneva, teden laktacije, trajanje predhodne presušitve in število somatskih celic ter starost ob telitvi kot kovariabla. Laktacije smo razdelili v šest obdobij in opravili analize znotraj vsakega obdobja. Analize so bile opravljene ločeno po laktacijah. Povečanje števila somatskih celic je vodilo do povečanja odstotka maščob in beljakovin, ki je bilo večje v zgodnjih obdobjih laktacije v primerjavi s kasnejšimi. Povečanje vsebnosti maščob in beljakovin je bilo tudi večje v prvi laktaciji kot v kasnejših laktacijah in je upadalo z zaporedno laktacijo.

Ključne besede


govedo; krave; molznice; pasme; holštajn; mleko; beljakovine; maščobe; število somatskih celic; laktacija; Iran

Celotno besedilo:

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Literatura


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DOI: http://dx.doi.org/10.14720/aas.2017.110.1.5

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Avtorske pravice (c) 2017 Arash CHEGINI, Navid GHAVI HOSSEIN-ZADEH, Hossein HOSSEINI-MOGHADAM, Abdol Ahad SHADPARVAR

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