Milking lactating mares using oxytocin : milk volume and composition

Doreau, M.; Boulot, Sylviane; Martin‐Rosset, W.; Dubroeucq, H.

doi:10.1051/rnd:19860101

Cited by 27 publications

(20 citation statements)

References 16 publications

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“…The obtained milk volumes per milking after correction for body weight were lower than those of naturally lactating mares [9], but were comparable with those of mares with induced lactation [2]. A previous report suggested that a mare with induced lactation was ready for adoption when milk production reached 3 to 5 l per day for a 500-kg horse [4].…”

Section: Discussionmentioning

confidence: 99%

Successful Induction of Lactation in a Barren Thoroughbred Mare: Growth of a Foal Raised on Induced Lactation and the Corresponding Maternal Hormone Profiles

Korosue

Murase

Sato

et al. 2012

The Journal of Veterinary Medical Science

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ABSTRAcT. The purpose of this study was to demonstrate that a barren parous Thoroughbred mare with lactation induced by hormonal treatment can be introduced to an orphan foal at the same farm and that the mare can become pregnant after the end of the hormonal treatment. An additional purpose was to investigate the changes in the plasma concentrations of prolactin, estradiol-17β, progesterone, folliclestimulating hormone, and luteinizing hormone before, during, and after hormonal treatment. The difference in body weight between the adopted foal and the control foals, which were at the same farm and raised by their natural mothers, was 17 kg at 24 weeks old, when the foals were weaned. However, the adopted foal and the control foals had almost the same weight at 35 weeks old and later. The first ovulation after hormonal treatment was confirmed 10 days after the end of hormonal treatment and then the normal estrous cycle resumed. Furthermore, the changes in plasma progesterone, estradiol-17β, follicle-stimulating hormone, and luteinizing hormone showed regular patterns after the first ovulation. Conception was confirmed in the fifth ovulation. Meanwhile, another study demonstrated that conception was confirmed in the first ovulation after hormonal treatment. The present study is the first to demonstrate the hormonal profiles during and after induction of lactation in a Thoroughbred mare. This approach is useful for solving the economic and epidemic problems of introducing a nurse mare to an orphan foal. KEY WORDS: hormonal treatment, horse, induction of lactation.

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Section: Discussionmentioning

confidence: 99%

Successful Induction of Lactation in a Barren Thoroughbred Mare: Growth of a Foal Raised on Induced Lactation and the Corresponding Maternal Hormone Profiles

Korosue

Murase

Sato

et al. 2012

The Journal of Veterinary Medical Science

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“…The analysis of milking (Doreau et al 1986a) showed that reproducibility of fat content was low from one milking to another. This may explain why lactose and N contents were less variable, except for colostrum N, as noted by Johnston et al (1970) and by Balbierz et al (1975).…”

Section: Individual Differencesmentioning

confidence: 96%

Yield and composition of milk from lactating mares: effect of lactation stage and individual differences

Doreau¹,

Boulot²,

Barlet³

et al. 1990

Journal of Dairy Research

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The yields and composition of milk from nursing mares were studied during the first two months of lactation in 11 mares of heavy breeds (784 kg). Daily yield increased from 21-7 to 24-6 kg between weeks 1 and 8 of lactation. Fat, protein, gross energy and Ca concentrations significantly decreased when lactose content increased during this period. Individual variations were higher for yield than for composition. Casein, whey protein and non-protein N (56, 34 and 10% of crude protein, respectively) and amino acid composition did not vary between weeks 1 and 8 of lactation.Information on the composition of milk from nursing mares is extensive: some 20 authors have studied the effects of lactation stage on milk fat and/or crude protein (Doreau & Boulot, 1989a). However, some components, such as those containing N, have seldom been studied in relation to lactation stage. Because of problems associated with the determination of milk production by lactating mares, simultaneous determinations of milk yield and composition are few. Moreover, some results are questionable because inaccurate methods were used (Doreau & Boulot, 19896). The most reliable are probably those of Oftedal et al. (1983).This trial was performed on a large number of mares managed individually under the same feeding scheme, in order to provide information on both milk yield and composition, and on nutrient output, and their variations according to individuals and to lactation stage. Special emphasis was placed on N fractions and amino acid composition. MATERIAL AND METHODS Animals and dietsEleven multiparous mares of heavy French breeds (Bretonnes, Comtoises), aged 5 to 16 years and weighing after foaling 784 + 39 kg, were managed indoors in individual boxes for the last month of pregnancy and for the first 2 months of lactation. All mares were in good condition at foaling. They were fed on a constant composition diet based on 85% natural grassland hay, first cut, and 15% concentrates containing 50% barley, 45% soyabean meal, 3 % molasses and 2% mineral premix. This diet was offered ad lib., with a mean of 10% hay refusals. The hay-concentrate ratio was adjusted daily. Hay was delivered 3 times/d and

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“…Mares were milked manually using a technique of mare-foal separation and oxytocin injection, according to the method of Doreau et al (1986a). Each milking represented the amount secreted during the mean time between two sucklings, depending on lactation stage, as determined in studies of nursing behaviour (MartinRosset et al 1978): 30, 40, 60 and 90 min for colostrum and milks from weeks 1, 4 and 8 respectively.…”

Section: Measurementsmentioning

confidence: 99%

Yield and composition of milk from lactating mares: effect of body condition at foaling

Doreau

Boulot

Chilliard

1993

Journal of Dairy Research

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SummaryThe yield and composition of milk from nursing mares were studied during the first 2 months of lactation in two groups of six and five saddle mares respectively made thin or fat before foaling, then fed ad lib. post partum. Milk yield did not significantly vary with body condition (16·5 and 15·4 kg/d for fat and thin mares respectively). Milk from fat mares had a higher fat content than milk from thin mares; the reverse was found for protein. The composition of milk fat was modified: milk of fat mares was poorer in short- and medium-chain fatty acids (C8-C14). Milk fat output was affected by body condition: 252 and 187 g/d for fat and thin mares respectively. This can be explained by a difference in lipid mobilization, as shown by variations in non-esterified fatty acids.

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Milking lactating mares using oxytocin : milk volume and composition

Abstract: Summary. Ten

Cited by 27 publications

References 16 publications

Successful Induction of Lactation in a Barren Thoroughbred Mare: Growth of a Foal Raised on Induced Lactation and the Corresponding Maternal Hormone Profiles

Successful Induction of Lactation in a Barren Thoroughbred Mare: Growth of a Foal Raised on Induced Lactation and the Corresponding Maternal Hormone Profiles

Yield and composition of milk from lactating mares: effect of lactation stage and individual differences

Yield and composition of milk from lactating mares: effect of body condition at foaling

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