نتایج جستجو برای: lactation performance

تعداد نتایج: 1062971  

Journal: :iranian journal of applied animal science 2015
h. atashi

the aim of this study was to investigate the effect of milking frequency (three times daily vs. two times daily) on the lactation curve shape, partial and 305-d lactation performance in holstein dairy cows in iran. data from february 2000 to december 2012 comprising 217345 lactations on 141364 cows distributed in 324 herds collected by the animal breeding center of iran were used. the mean milk...

Journal: :iranian journal of veterinary research 2013
h. atashi m. j. zamiri a. akhlaghi m. dadpasand m. b. sayyadnejad

this study was carried out to investigate the relationship between early lactation curve parameters andcalving interval in holstein cows of iran. in order to describe the lactation curve, the incomplete gammafunction was fitted to 5,754,428 test-day milk records corresponding to 766,108 lactations on 315,634 cowsin 2,448 herds. cows with higher milk yield during early lactation had shorter calv...

Journal: :iran agricultural research 2012
h. atashi m. j. zamiri m. b. sayyadnejad

the aim of this study was to determine the factors affecting stillbirth and the consequences of stillbirth on longevity, production, and reproductive performance in holstein cows of iran. calving records from march 2000 to april 2009 comprising of 220,043 calvings on 102,199 cows in 33 herds were used. the results showed that 4.06% of the newborn calves died within 48 h of birth. the stillbirth...

Journal: :iranian journal of veterinary research 2011
h. atashi

the purposes of this study were to estimate the effects of risk factors on stillbirth parturition and evaluatethe effects of stillbirth on lactation performance in holstein dairy cows. data were obtained from a dairycattle herd located in isfahan province, iran. the logit of the probability of stillbirth was modeled usinglogistic regression and the effect of stillbirth on lactation performance ...

A. Mirzaei A. Omidi, Kh. Nowroozi M. Mohebbi-Fani S. Nazifi

Background: It was hypothesized that under apparently good management practices in dairy farms, some cows may not be metabolically perfect during the breeding period and this may affect their performance. Aims: This study was conducted to assess probable metabolic drawbacks in mid-lactation dairy cows affecting their performance. Methods: Thirt...

Journal: :iranian journal of applied animal science 2015
m. jahani-moghadam e. mahjoubi h. amanlou s. mohammadi

this experiment was performed to investigate whether feeding xylose-treated soybean meal (xsbm) or corn gluten meal (cgm) is economically better under field conditions. ninety-four multiparous early lactating holstein cows (55±5 days in milk and 2.82±0.41 body condition score) were used in a completely randomized design. cows were randomly assigned to one of two treatments: xsbm or cgm as the m...

Journal: :Physiological genomics 2013
Jerry Wei Palaniappan Ramanathan Ian C Martin Christopher Moran Rosanne M Taylor Peter Williamson

Mammary transcriptome analyses across the lactation cycle and transgenic animal studies have identified candidate genes for mammogenesis, lactogenesis and involution; however, there is a lack of information on pathways that contribute to lactation performance. Previously we have shown significant differences in lactation performance, mammary gland histology, and gene expression profiles during ...

The purposes of this study were to estimate the effects of risk factors on stillbirth parturition and evaluatethe effects of stillbirth on lactation performance in Holstein dairy cows. Data were obtained from a dairycattle herd located in Isfahan province, Iran. The logit of the probability of stillbirth was modeled usinglogistic regression and the effect of stillbirth on lactation performance ...

2010
S. Battiato G. M. Farinella G. C. Guarnera G. Puglisi G. Azzaro M. Caccamo G. Licitra J. D. Ferguson

The energy reserves in cows in terms of body fat stores and mobilization during the different lactation stages have important implications for milk production, animal well-being, reproductive performance, and, more generally, farm productivity. This study explores the possibility to efficiently semiautomate the process of body condition scoring using images acquired by commercial low-cost digit...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید