نتایج جستجو برای: holstein dairy cows

تعداد نتایج: 63941  

2013
Clara I. Gonzalez Oswaldo Rosendo

The present on-farm research evaluated the occurrence of fatty liver syndrome and its predisposing risk factors for multiparous dairy cows from a commercial herd in Venezuela. Liver biopsy samples were collected at 35 days (d) prepartum (Holstein, n = 14; Holstein × Carora crossbred, n = 17) as well as 1 to 7 d (Holstein, n = 8; Holstein × Carora crossbred, n = 11) and 28 to 35 d (Holstein, n =...

Journal: :iranian journal of applied animal science 2015
m.s. el-tarabany m.a. ali

this study utilized daily records of 2000 egyptian holstein dairy cows. the productive, reproductive and economic data during a whole lactation season were recorded for healthy and mastitis cows. two risk factors for mastitis were included, parity and season of calving. mastitis cows had significant (p

Journal: :Genetics and molecular research : GMR 2011
R J Pereira M L Santana A B Bignardi R S Verneque L El Faro L G Albuquerque

We investigated the effect of stage of pregnancy on estimates of breeding values for milk yield and milk persistency in Gyr and Holstein dairy cattle in Brazil. Test-day milk yield records were analyzed using random regression models with or without the effect of pregnancy. Models were compared using residual variances, heritabilities, rank correlations of estimated breeding values of bul...

Journal: :پژوهش های علوم دامی ایران 0
ابوالفضل کیانی احمد ریاسی سعید انصاری مهیاری غلامرضا قربانی محمد خوروش

the objective of this study was to evaluate the effect of different milking frequencies in the first 6 weeks of lactation on milk production and milk constituents, blood metabolic profiles and reproductive performance of fresh dairy cows. the milking frequencies imposed were three times daily milking for 42 days (3x), six times daily milking for the first 21 days of lactation and three times da...

Journal: :The Journal of dairy research 2011
Valérie Piccand Susanne Meier Erwan Cutullic Sara Weilenmann Peter Thomet Fredy Schori Chris R Burke Daniel Weiss John R Roche Peter L Kunz

The objectives of the study were to compare the ovarian activity of Holstein-Friesian (CH HF), Fleckvieh (CH FV) and Brown Swiss (CH BS) dairy cows of Swiss origin with that of Holstein-Friesian (NZ HF) dairy cows of New Zealand origin, the latter being used as a reference for reproductive performance in pasture-based seasonal calving systems. Fifty, second-lactation NZ HF cows were each paired...

Journal: :علوم دامی ایران 0
وحید غلامی کارشناس ارشد، دانشگاه زنجان حمید امانلو دانشیار، دانشگاه زنجان

the aim followed in the present research was to study the effects of reduction in dietary crude protein on milk production and on blood components in lactating holstein dairy cows when in heat stress. a number of 63 holstein dairy cows (71 ± 16.5 dim) were chosen to be made use of in a randomized complete block design. the cows were randomly assigned to any one of the three experimental rations...

Journal: :iranian journal of veterinary research 2013
n. ghavi hossein-zadeh a. mohit n. azad

calving records from april 1996 to december 2005 comprising 31863 calving events of 1173 dairy cows in a large commercial dairy herd were used to evaluate the effects of heat stress, using temperature-humidity index (thi) on milk yield and composition and reproductive performance of holstein dairy cows under humid climatic conditions of rasht in iran. thi values were grouped into six groups: 30...

2013
K. Zhu G. L. Liu L. M. Huang C. B. Zhang F. S. Fu

The objective of this study was to analyze the correlation between Holstein body conformation traits and milk production traits in the Shanghai region. In total, 871 Holstein cows were randomly chosen from 28 dairy farms in Shanghai at second stage of lactation as the object of our study. Five milk production traits, including 305-d milk yield, butter fat percentage, milk protein percentage, pe...

Journal: :The American journal of Chinese medicine 2007
J Y Lee M R Lee J H Kim T S Han S S Kang C S Bae D H Kim G Kim S H Choi

This study was performed to assess the efficacy of moxibustion after rolling correction in dairy cows with abomasal displacement (AD). The experimental group comprised 86 Holstein cows with left displacement of the abomasum (LDA) and right displacement of the abomasum (RDA), with a mean age of 3.8 with AD during a 2-year period. The cows were rolled for correction of AD. After the rolling proce...

2016
Ayami MAETANI Megumi ITOH Kahori NISHIHARA Takahiro AOKI Masayuki OHTANI Kenichi SHIBANO Mitsunori KAYANO Kazutaka YAMADA

The aim of this study was to assess the measurement of bone mineral density (BMD) by quantitative computed tomography (QCT), comparing the relationships of BMD between QCT and dual-energy X-ray absorptiometry (DXA) and between QCT and radiographic absorptiometry (RA) in the metacarpal bone of Holstein dairy cows (n=27). A significant positive correlation was found between QCT and DXA measuremen...

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