To support the high energetic demands of reproduction, female mammals display plasticity in many physiological processes, such as the lipid transport system. Lipids support the energy demands of females during reproduction, and energy and structural demands of the developing offspring via the placenta in utero or milk during the suckling period. We hypothesized that key proteins supporting lipi...

The aim of this study was the evaluation heat stress in milk production dairy cows (daily yield; 1st lactation). comparison performed between fraternal twins (full sisters), produced on same farm and parity. One a hot period whereas her sister cooler period. Also, there can be differences twins. Therefore, second group also created that without stress. Databases were analysed using PROC GLM ana...

OBJECTIVE The aim of the current study was to describe the relationship between milk yield and lactation number, stage, length and milking frequency in Korean Holstein dairy cows using an automatic milking system (AMS). METHODS The original data set consisted of observations from April to October 2016 of 780 Holstein cows, with a total of 10,751 milkings. Each time a cow was milked by an AMS ...

Changes of macromineral and trace element concentration in the blood ewes during lactation period | Zvonko Antunović, Boro Mioč, Zdenko Lončarić, Željka Klir Šalavardić, Ivan Širić, Valentino Držaić, Josip Novoselec Agricultural Journals

The objective of the current study was to evaluate the effect of bovine somatotropin (bST) on milk yield and composition of Holstein cows in early and very early lactations. Twenty-two lactating Holstein cows averaging 62 days in milk (DIM:25-115), 28.5 kg/d milk, a body condition score (BCS) of 2.87, and 648.2 kg of body weight (BW), were assigned to one of the four treatments in a completely ...

the fixed regression test-day model (frm) and random regression test-day model (rrm) for genetic evaluation of milk yield trait of dairy cattle in khorasan razavi province were studied. breeding values and genetic parameters of milk yield trait from two models were compared. a total of 164391 monthly test day milk records (three times milking per day) obtained from 19217 holstein cows distribut...

Thirty-six primiparous sows were assigned to one of five treatments designed to mimic the lactation feed intake patterns observed in a previous study of commercial farms: high energy intake (HHH) or low energy intake during each week of a 3-wk lactation (LLL), or reduced intake during wk 1 (LHH), wk 2 (HLH) or wk 3 of lactation (HHL). The metabolizable energy intake of sows was either 16.5 (H) ...

abstract             (co) variance components of milk, fat and protein yield of 11368 first lactation iranian holstein dairy cow were estimated by single trait random regression test-day models and restricted maximum likelihood (reml) method. in this study the homogeneous residual variance was assumed throughout lactation. estimated heritability for 305-day production traits ranged from 0.25 to...

The rearing of large litters from hyperprolific sows is a characteristic modern genotypes. However, these have body and reproductive characteristics that differentiate them the genotypes past decades, making it necessary to adopt different management strategies. This review describes main care challenges associated with hyperprolificity during period in which replacement gilts are selected, alo...