Vpliv vremenskih razmer v času presušitve krav molznic na kakovost mleziva in zdravstveno stanje telet : magistrsko delo, magistrski študij - 2. stopnja

Fidler, Darinka (author), Klopčič, Marija (mentor), Klinkon Ogrinec, Martina (comentor)

Po telitvi je novorojeno tele izpostavljeno okolju polnemu patogenih organizmov. Tele še nima lastne imunske zaščite, zato je zelo pomembno, da mu jo čimprej zagotovimo. V poskusu, ki je trajal od junija do konca decembra 2019, nas je zanimalo, kateri dejavniki v času presušitve krav molznic vplivajo na kakovost mleziva. V poskus je bilo vključenih 7 kmetij. V tem času je v teh čredah telilo 42 krav. Pri vseh kravah smo ugotavljali kakovost mleziva v prvih 24 urah po telitvi s pomočjo digitalnega refraktometra. Preverjali smo vpliv meseca telitve, zaporedne telitve in dobe presušitve na kakovost mleziva in zdravstveno stanje telet. S statističnim modelom smo pojasnili 52,7 % variabilnosti. Rezultati kažejo, da na kakovost mleziva vplivata mesec telitve in trajanje dobe presušitve, medtem ko zaporedna telitev ni vplivala. Večja kot je količina mleziva, manjši je delež beljakovin v njem. Od 42 telet sta bila 2 mrtvorojena, trije pa so poginili v prvih treh mesecih po telitvi. Ugotovili smo, da če presušeno dobo podaljšamo za en dan, se kakovost mleziva izboljša za 0,07 %. V primeru, da presušeno dobo podaljšamo z 20 na 60 dni, se kakovost mleziva izboljša za 2,8 %. Boljša kot je kakovost mleziva, večje možnosti ima tele, da preživi in čimprej doseže dobre proizvodne rezultate.

• Language: Slovenian
• Keywords: govedo, krave molznice, presušitev, okoljski dejavniki, mlezivo, kakovost, teleta, zdravstveno stanje
• Work type: Master's thesis/paper
• Organization: BF - Biotechnical Faculty
• Year: 2021
• PID: 20.500.12556/RUL-130253
• COBISS.SI-ID: 76776451
• Publication date in RUL: 12.09.2021

Secondary language

• Language: English
• Title: Influence of weather conditions during dry-off period of dairy cows on quality of colostrum and health situation of calves : M. Sc. Thesis, Master Study Programmes

Abstract

The newborn calf is exposed to the environment full of pathogenic organisms. The calf does not yet have its own immune protection so it is very important of us to make it possible for it. In our experiment, which lasted from June to the end of December 2019, we wanted to know what factors affect colostrum quality. The experiment included 7 farms. During this time 42 cows had calves. We measured the colostrum of all these cows in the first 24 hours after calvingusing a digital refractometer. We checked if the month of calving, number of lactations and length of dry standing period had an effect on colostrum quality and calf health. Using this model we explain 52.7 % variance. The results show us that the length of the dry period and the month of calving influence the colostrum quality, while parity have no influence. The greater the quantity of colostrum, the lower the protein content in it. Out of 42 calves there were 2 stillbirths and, 3 calves died in the first three months after calving. We found that colostrum quality improved by 0.07 % when we extended the dry period by one day. That is, if we extend the dry standing time from 20 to 60 days, the colostrum quality improves by 2.8 %. The better the colostrum quality, the greater the chances for the calves to survive and achieve good production results as quickly as possible.

• Keywords: cattle, dairy cows, dry-off period, barn, environmental factors, colostrum, quality, calves, health