• Journal of the Korean Society of Food Science and Nutrition
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• v.26 no.5
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• pp.983-992
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• 1997

During pregnancy and lactation, folate status is important because folate requirements increase during the periods as well as maternal folate status influences on pregnancy outcome and human milk folate; especially folate deficiency around periconceptional period may induce neural tube defects(NTDs) of fetus. There have been a plenty of evidences that maternal folate status deteriorates during pregnancy of fetus. There have been a plenty of evidences that maternal folate status deteriorates during pregnancy and lactation if folate needed is not sufficiently provided. The Public health Service of the United States recommends all child-bearing is not sufficiently provided. The Public Health Service of the United States recommends all child-bearing women to intake 0.4mg of folate daily, and the Food and Drug Administration the folate status of child-bearing women and to reduce the rate of occurrence of NTDs. Many authors have insisted that the current recommended dietary allowances of folate for Americans are too low to maintain good folate status. There are little data about Korean folate status including pregant and lactating women. A couple of reports indicated that the folate intakes of Korean pregant and lactating women are below the Korean RDAs of folate and serum folate levels of them are subnormal. The authors pregnant and lactating women. Therefore, it is worth to review the assessment methods of folate status of pregnant and lactating women, folate RDAs for them, the relationships between maternal folate status and pregnancy outcome as well as human milk folate, the methods to increase folate intake, and the problems of large dose of folic acid supplementatiion.

• Journal of Nutrition and Health
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• v.36 no.7
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• pp.743-748
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• 2003

This study was longitudinally conducted to evaluate vitamin A intake of exclusively breast-fed infants compared with the Recommended Dietary Allowances (RDA) for Korean infants. Twenty-seven Korean lactating women and their infants during the first 6 months of lactation in Cheongju and Anseong areas were participated. Retinol and $\beta$-carotene contents in the milk were determined using HPLC and also the milk consumption of the infants was measured by the test-weighing methods. Vitamin A (retinol and $\beta$-carotene) contents of the milk were 65.7, 57.2, 48.1, 43.9, 38.2, 38.7 and 44.0 R.E./100 ml, and vitamin A intakes of the breast-fed infants were 361, 402, 348, 331, 304, 305 and 322 R.E./day at 0.5, 1, 2, 3, 4, 5 and 6 month of lactation, respectively. The average intake of vitamin A was 339.1 R.E./day and the percentage to RDA was 96.9% during 6 months. Vitamin A intakes per body weight of the breast-fed infants were 96.7, 88.3, 62.1, 50.0, 41.8, 39.3 and 39.6 R.E./kg/day at 0.5, 1, 2, 3, 4, 5 and 6 month. The body weight increased normally from 3.4 $\pm$ 0.5 kg at birth during lactation. It is suggested that the breast-fed infants in Cheongju and Anseong areas consumed adequately vitamin A from the milk compared with RDA for Korean infants.

• Asian-Australasian Journal of Animal Sciences
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• v.13 no.12
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• pp.1699-1707
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• 2000

Thirty-one multiparous Bos indicus${\times}$Bos taurus cows were offered concentrate supplements based on (1) 2 kg wheat bran; (2) 4 kg wheat bran; and (3) concentrate (30 maize: 67 wheat bran) at 0.5 kg per 1.0 kg milk produced, in a one year study in India. All supplements also contained 2 parts of a mineral mixture and 1 part salt. Cows were allocated to treatments at calving on parity (2nd and 3rd calf) with 13, 8 and 10 cows respectively in treatments 1, 2 and 3. They were individually fed for whole lactation, the basal diet being ad libitum berseem clover plus 2 kg wheat straw in the cool season/winter (period 1) and chopped maize in summer (period 2). Diets with berseem offered TDN and CP contents of 67.6, 18.2; 65.5, 16.8; and 67.5, 16.8 percent; and with maize fodder 62.6, 12.0; 62.6, 12.5; and 63.3, 12.5 percent for treatments 1, 2 and 3, respectively. Total dry matter (DM) intakes (1) 9.9 kg, (2) 10.9 kg and (3) 11.1 kg DM/day and intake of nutrients (TDN, CP) increased with level of supplementation (p<0.01), but effects of treatment on animal performance were not significant. Cow milk yields averaged (1) 7.9 kg, (2) 8.1 kg and (3) 8.8 kg milk/day (p>0.05) for lactation lengths of 252, 270 and 220 days (p>0.05) and cows gained +7.3; +8.1; and +12.0 kg respectively over their lactation (p>0.05). Wheat bran was used effectively as the sole energy component in concentrates for lactating dairy cows. Its use could potentially reduce feed costs and demands for cereal grain. Reduced concentrate levels may be considered if green forages of high nutrient content are fed ad libitum. Associated economic advantages or disadvantages require further evaluation.

• Asian-Australasian Journal of Animal Sciences
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• v.25 no.9
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• pp.1338-1350
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• 2012

This review focuses on the nutritional effects from birth until age at first calving on growth, mammary developmental changes, and first-lactation milk yield in heifer calves. The advancement in the genetic potential and the nutritional requirements of the animals has hastened the growth rate. Genetic selection for high milk yield has suggested higher growth capacity and hence increasing nutritional inputs are required. Rapid rearing by feeding high energy or high concentrate diets not only reduces the age of sexual maturity but also lowers the time period of attaining the age of first calving. However, high energy diets may cause undesirable fat deposition thereby affecting future milk yield potential. Discrepancies exist whether overfed or overweight heifers at puberty can influence the mammary development and future milk yield potential and performance. The data on post-pubertal nutritional management suggested that body weight at calving and post-pubertal growth rate is important in first lactation milk yield. There is a continuous research need for strategic feeding that accelerates growth of dairy heifers without reduction in subsequent production. Nutritional management from birth, across puberty and during pregnancy is critical for mammary growth and for producing a successful cow. This review will mostly highlight studies carried out on dairy breeds and possible available opportunities to manipulate nutritional status from birth until age at first calving.

• Journal of Nutrition and Health
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• v.24 no.3
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• pp.219-229
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• 1991

The longitudinal changes on human milk volume per day and lactational performance of 23 Korean lacto-ovo-vegetarians(primiparae=11, multiparae=12) from 0.5 to 5 months after parturition have been studied by test weighing method. The human milk volume per day tended to increase during lactation. The mean volume (SD, ml/day) at 0.5, 1, 2, 3, 4, 5 months were 502(102), 692(127), 697(100), 684( 125), 757(52), 703(70), respectively. The overall mean volume was 661$\pm$132ml/day. The peak milk volume during the lactation was observed at most lactating women at the 1st month. The distributions of the individual mean volume during the first 5 months of lactation were found over 750m1(8.7% ), 650-750ml(47.9% ), 550-650m1(2l.7% ), and 450-550ml(2l.7% ) The number of feeding per day was 8.1 ($\pm$1.0) at 0.5 months postpartum, which was consistently decreased. However, the mean volume per feeding was increased from 62($\pm$9.5)ml at 0.5 month to 112($\pm$13.3)ml at 5 months postpartum. The milk volume was correlated with the peak volume. and maternal age. but not with weight before delivery. maternal height and birth weight. No differences of milk volume and lactational performance between facto-ovo-vegetarian and nonvegetarian women were observed. This study suggests that the human milk volume cited in the recommended dietary allowances for Koreitns is over estimated.

• Journal of Nutrition and Health
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• v.29 no.8
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• pp.908-915
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• 1996

Protein concentration in human from 39 well-norished American women and its adequacy for growth of exclusively breastfed infants(BF) and breastfed infants fed supplementary foods(BFS)from 1-6 months postpartum were studied. Mean protein concentration of breast milk measured by Lowry et al., using human serum albumin as a standard, over the first 6 months lactation was 1.31$\pm$0.13g/dl. Concentration of protein was singnificantly higher at the first month of lactation (1.55$\pm$0.23g/dl)(P<0.05) than any other month studied. Mean volume of breast milk ranged from 662-848ml/day in the BE group and from 415-661ml/day in the BFS group during the first 6 months of lactation. Mean protein intake of infants ranged from 1.3-2.2g/kg in the BF group and from 1.4-2.1g/kg in the BFS group. Mean protein intake (g/kg body weight) of both BF and BFS groups was less than Recmmended Dietary Allowance(1989, USA) of 2.2g/kg except at 1 month of age. However, mean growth of the infants was normal according to NCHS reference, suggesting that the RDA for protein was unrealistically high for infants during 2-6 months of age. Protein provided by breast milk alone appeared adequate for normal growth during this time.

• Animal Bioscience
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• v.35 no.8
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• pp.1151-1161
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• 2022

Objective: This study was conducted to estimate the association of age at first calving (AFC) with first lactation traits as well as lifetime performance traits in Murrah buffaloes. Methods: Data on first lactation and life time performance of Murrah buffaloes (n = 679), maintained at Indian Council of Agricultural Research-Central Institute for Research on Buffaloes, Hisar, India during the period 1983 through 2017, were deduced to calculate heritability estimates, genetic and phenotypic correlation of different first lactation and lifetime traits. The univariate animal model was fitted to estimate variance components and heritability separately for each trait, while bivariate animal models were set to estimate genetic and phenotypic correlations between traits under study. Results: The heritability was high for first peak milk yield (FPY, 0.64±0.08), moderate for AFC (0.48±0.07) and breeding efficiency (BE 0.39±0.09). High genetic correlations of first lactation total milk yield (FLTMY) with first lactation standard milk yield (FLSMY, 305 days or less), FPY, and first lactation length (FLL) was seen. Likewise, genetic correlation of AFC was positive with FLTMY, FLL, first dry period (FDP), first service period (FSP), first calving interval (FCI), herd life (HL) and productive days (PD). Significant phenotypic correlation of FLTMY was observed with HL, productive life (PL), PD, total lifetime milk yield (LTMY), standard lifetime milk yield (standard LTMY). Moreover, positive genetic and phenotypic correlation of FPY was observed with HL, PL, PD, total LTMY and standard LTMY. Conclusion: This study reports that AFC had positive genetic correlation with FDP, FSP, FCI, and unproductive days while, negative association of AFC was observed with FLSMY, PL, total LTMY, standard LTMY, and BE. This suggests that reduction of AFC would results in improvement of lifetime performance traits.

• Nutritional Sciences
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• v.8 no.4
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• pp.256-261
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• 2005

Although nutrition education for pregnant women is important, few such programs have been carefully examined from the participants' perspective in Korea. Focus groups were used to identify 1) perceived eating behaviors during pregnancy and lactation, 2) factors associated with healthy eating behaviors, and 3) needs for nutrition education programs. Using a trained moderator, we conducted 7 focus group interviews with 44 pregnant women over a four-month period. Focus group discussions were video - and audio - taped, transcribed and categorized by major themes. Participants expressed interest in receiving nutrition education regarding healthy eating, weight control after delivery, weaning foods and health management, yet they showed little interest in breastfeeding. The majority of them said that meal balance and meal regularity were the most important components of good health during pregnancy. They were less likely to be confident about taking dietary supplements, including Oriental medicines. life stress and poor appetite associated with pregnancy were major barriers to healthy eating habits during pregnancy. The most important sources of nutrition and health information were friends and family members, especially those who had become pregnant recently. Qualified educators and reliable information appeared to be the most important aspects of program development. Regarding types of nutrition education, participants tended to prefer a combination of individual counseling and small group education with hands-on materials and interactive formats. The use of Web-based nutrition education was well received Major concerns about Web-based nutrition education were authenticity, tailored messages and interactive formats for sharing information. These results offer useful information for designing nutrition education programs for pregnant and lactating women in Korea for health promotion.

• Journal of Nutrition and Health
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• v.17 no.3
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• pp.199-209
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• 1984

Pregnant rats were fed a pyridoxine deficient diet during the gestation and lactation. DEF I group received the deficient diet from delivery ; DEF II group, from the 15 th day of gestation. Body and brain weights, brain protein, DNA, RNA, plasma GOT and GPT, and catecholamines were measured. Effect of MAO inhibiting drug, pargyline, was determined. Brain protein, DNA, and RNA of offsprings of deficient groups were significantly lower than the control group, but RNA/ DNA, brain weight/DNA, and protein/DNA show that cell number were more affected than cell size by the pyridoxine deficiency during the 3rd week of gestation and lactation. Plasma GOT activities were more significantly different than plasma GPT between the control and deficient group. Brain norepinephrine of offsprings of deficient group were significantly lower than the control, but brain dopamine content was not significantly different from the control. At 2nd and 3rd week, norepinephrine was significantly depressed in deficient groups. Pargyline treatment affected a 1.2 fold increase in catecholamines in 3hr while the control had a 1.5 fold increase. Thus norepinephrine and dopamine synthesis was depressed in the deficient groups. Dopaminergic neurons may be less dependent on pyridoxine level than neurons from norepinephrine. Pyridoxine deficiency in maternal diet is not so critical to brain catecholamines of offspring except to the neonatal rats.

• Asian-Australasian Journal of Animal Sciences
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• v.16 no.2
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• pp.204-210
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• 2003

To see the effect of Beragfat T-300, a by pass fat, on the production and composition of milk, four primiparous crossbred cows in their early lactation were used in a $4{\times}4$ Latin Square Design. Each period was of 30 days including 15 days of adjustment period. The diets were formulated to contain 0, 2.5, 3.5 and 4.5% of Bergafat and were isonitrogenous and isoenergetic. The intake of DM, OM, CP, NDF, ADF, Cellulose and ADL were not affected, however, the EE intake was increased by the supplementation of Bergafat in the diet of cows. The digestibilities of NDF and EE remained unaffected, whereas the digestibilites of DM, OM and CP were reduced. Milk yield remained unaltered, while 4%FCM yield increased as a result of adding Bergafat in the daily ration. Bergafat upto 4.5% of the diet DM can be added in the diet of crossbred cows without any adverse effect on the DM intake and digestibilities of DM and NDF. Furthermore, Bergafat does not cause any butter fat depression in the milk of cows.