We read with interest the enlightening article by Romieu et al. (1) on breastfeeding in relation to risk of breast cancer among women in Mexico City. The widespread practice of long-duration lactation has given these researchers the ability to address questions that could not be easily answered using data from most industrialized countries. We were, however, puzzled by a few points made in the ...

Introduction: The extreme reduction in breast milk intake during the first days of life leads to weight loss, kidney failure and hypernatremia. The aim of this study was to examine the relationship between hypernatremia in neonates and way of maternal breastfeeding in hospitalized infants in Ghaem Hospital of Mashhad.   Materials and Methods: After obtaining parental consent, 687 infants referr...

BACKGROUND Lactation has beneficial short term effects on maternal metabolic health, but the long term effects are less well known. METHODS We studied the association between lifetime duration of lactation and cardiovascular risk factors in mothers later in life among 21,368 parous women aged 20 to 85 years attending the second Nord-Trøndelag Health Study (HUNT2) in 1995-1997, Norway, a cross...

Two experiments were performed to test the hypothesis that suckling behavior of calves with similar growth potential varies depending on cows' level of estimated milk production and stage of lactation. Eleven mature cows, which varied in estimated 205-d milk production (996 to 2354 kg/205 d), nursing heifer calves of similar growth potential were used in Exp. 1. Suckling behavior of calves was ...

Rumination (duration of cud in cows per day) becomes an effective and reliable test that characterizes the general state metabolism their body, process digestion predicted level productivity. In experiment on array dairy at Petrodolinsky LLC, using a remote electronic control system with SCR Heatime HR-IR feeding behavior monitoring function, nature rumination was observed depending age lactati...

This study was designed to determine the effects of semen type and calf gender on milk yield parameters, electrical conductivity flow values postpartum maternal body weight. A total 265 Holstein cows in first lactation were used study. The effect sperm weight levels after calving significant (P0.05). Heifers inseminated with sexed had higher 100-days yield, peak lactation. Milk duration heifers...

The Ural type of the domestic Black-and-White mottled breed is characterized high milk-yield rates and good suitability for industrial milking technology. milk yield increase led to a deterioration reproductive functions in livestock. As result research it was found that process prolonged using cattle, cows regularly changes, reaching highest among mature by 3rd lactation, then gradually decrea...