نتایج جستجو برای: early lactation

تعداد نتایج: 698184  

Journal: :American journal of physiology. Regulatory, integrative and comparative physiology 2016
Nicholas H McCormick Sooyeon Lee Stephen R Hennigar Shannon L Kelleher

During lactation, highly specialized secretory mammary epithelial cells (MECs) produce and secrete huge quantities of nutrients and nonnutritive factors into breast milk. The zinc (Zn) transporter ZnT4 (SLC30A4) transports Zn into the trans-Golgi apparatus for lactose synthesis, and across the apical cell membrane for efflux from MECs into milk. This is consistent with observations in "lethal m...

Journal: :Journal of dairy science 2005
G Banos S Brotherstone M P Coffey

Weekly total body energy content (TBEC) was calculated for 444 Holstein cows in their first 3 lactations. These calculations were based on body lipid and protein changes predicted from weekly changes in body condition score and live weight of each cow. In first lactation, cows lost TBEC during the initial 8 wk, regained it by wk 22, and continued to build up their reserves until wk 37. Cows sta...

Journal: :The British journal of nutrition 1985
J D Oldham D J Napper T Smith R J Fulford

Sixteen Friesian cows were used in Expt 1 to measure the effect of substituting urea-N with fishmeal-N either in early lactation (Part 1) or in mid-lactation (Part 2). In Part 1 (days 15-84 of lactation) the major N constituent of the concentrate was urea (U), urea-N: fishmeal-N in the ratio 2:1 (UF) or 1:2 (FU), or fishmeal (F). In Part 2 (days 84-175 of lactation) only urea (UM) and fishmeal ...

Journal: :Veterinary research 2001
F Vangroenweghe H Dosogne J Mehrzad C Burvenich

Three different milk sampling techniques were evaluated during milk sampling: a direct aseptic collection from the udder through a sterile cannula was used as the reference technique, compared with either a manual or a mechanical sampling method. In this study 30 high-yielding Holstein-Friesian dairy cows at different stages of lactation and free of udder infection were used. For each milk samp...

Journal: :Journal of animal science 2008
E H Wall T B McFadden

In the past century, great strides have been made toward optimizing milk production efficiency of dairy cows. One of the key findings that has emerged is that the milk yield of dairy cows is responsive to demands of offspring or milk removal; hence, milk production can be increased by frequent milking. Early studies illustrated the galactopoietic effect of frequent milking during the entire lac...

2017
Shuai Yu Yong Zhao Fangnong Lai Meiqiang Chu Yanan Hao Yanni Feng Hongfu Zhang Jing Liu Ming Cheng Lan Li Wei Shen Lingjiang Min

The main function of the mammary gland is to secret milk for newborn growth. Milk production process is regulated by hormones, growth factors, noncoding RNAs and other factors locally. Long non-coding RNAs (lncRNAs), one type of recently discovered non-coding RNA, have been found in mammary gland and some studies suggested lncRNA may play important roles in mammary gland development. Competing ...

2015
Chengquan Tan Hongkui Wei Haiqing Sun Jiangtao Ao Guang Long Siwen Jiang Jian Peng

Fifty-four multiparous large white sows were used to determine the effects of supplementing oregano essential oil (OEO) to the gestation and lactation diets on oxidative stress status, lactation feed intake, and their piglet performance. Two groups were fed diets with (OEO; n = 28) or without (Control; n = 26) supplemental 15 mg/kg OEO during gestation and lactation. The serum levels of reactiv...

Journal: :Journal of dairy science 1995
F Beaudeau V Ducrocq C Fourichon H Seegers

Data from a survey performed from 1986 to 1990 were analyzed to assess the effects of diseases on length of productive life of 3589 Holstein cows from 47 herds, using a proportional hazard model. The probability of a cow being culled, or hazard function, was supposed to be the product of an unspecified baseline hazard function and log-linear, time-dependent explanatory variables that possibly i...

2016
Michael Affolter Clara L. Garcia-Rodenas Gerard Vinyes-Pares Rosemarie Jenni Iris Roggero Ornella Avanti-Nigro Carlos Antonio de Castro Ai Zhao Yumei Zhang Peiyu Wang Sagar K. Thakkar Laurent Favre

Human breast milk (BM) protein composition may be impacted by lactation stage or factors related to geographical location. The present study aimed at assessing the temporal changes of BM major proteins over lactation stages and the impact of mode of delivery on immune factors, in a large cohort of urban mothers in China. 450 BM samples, collected in three Chinese cities, covering 8 months of la...

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...

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