Some observations on the lactation of Blackhead ewes and the growth of lambs: the composition and yield of milk

Butterworth, M. H.; Houghton, T. R.; Macartney, J. C.; Prior, A.; Middlemiss, C. P.; Edmond, David

doi:10.1017/s0021859600011072

Cited by 12 publications

(6 citation statements)

References 10 publications

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“…For neither singles nor twins were sex differences a significant source of variation in G. For single lambs, deviations were in the order and of the magnitude reported in the literature (Butterworth et al, 1968;Levine and Hohenboken, 1978). That is, males gained more than females.…”

Section: Resultsmentioning

confidence: 65%

“…The We publish these equations and associated r 2 values, however, to aid investigators who might wish to estimate milk production, which is costly and difficult to measure, from lamb weight gain, which is much easier to measure. (1955), Barnicoat et al ( , 1956d, , Munro (1962), Slen et al (1963), Folman et al (1966a, 1966b, Moore (1966), Peart (1967, Scales (1968), Butterworth et al (1968, Robinson et al (1969), Acharya andBawa (1971), Geenty and and Peart et al (1975) that ewe milk production is the most important variable influencing lamb weight gain in the early stages of lactation but that the effect of milk production tends to decline as lambs become more dependent upon the intake of forage or grain. With MP in the model for single lambs, the regression coefficient of total lactation G on PMP was large and positive.…”

Section: Introductionmentioning

confidence: 99%

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Relationships between Ewe Milk Production and Composition and Preweaning Lamb Weight Gain

Torres-Hernández

Hohenboken

1980

Journal of Animal Science

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Section: Resultsmentioning

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Relationships between Ewe Milk Production and Composition and Preweaning Lamb Weight Gain

Torres-Hernández

Hohenboken

1980

Journal of Animal Science

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“…1). Within 2-6 days after parturition, the concentration of lactose increased to levels found in the milk of normal ewes (Butterworth, Houghton, Macartney, Prior, Middlemiss & Edmond, 1968;Corbett, 1968).…”

Section: Milk Lactose and Blood Progesteronementioning

confidence: 88%

Progesterone and Oestrogen and the Initiation of Lactation in Ewes

Hartmann¹,

Trevethan²,

Shelton³

1973

Journal of Endocrinology

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The concentrations of lactose and progesterone were determined in mammary secretion and blood plasma, respectively, collected from ten ewes at daily intervals from 30 days before to 10 days after parturition. An initial increase in the concentration of lactose in the mammary secretion occurred as early as 30 days before parturition and was not related to changes in the concentration of progesterone in the peripheral plasma. On the other hand, there was a rapid fall in the concentration of progesterone in the peripheral plasma from 1 to 4 days before parturition and this fall was closely related to a second rapid increase in the concentration of lactose in the mammary secretion. The foetuses were removed from an additional 12 ewes by Caesarean section at 144 days of gestation; three ewes received no hormone therapy; three ewes received 62\m=.\5mg progesterone/12 h for 5 days; three ewes received 2\m=.\0 mg oestradiol at 12, 24 and 36 h respectively after surgery; three ewes received both progesterone and oestrogen therapy.Whereas progesterone inhibited the increase in milk yield and lactose concentration after Caesarean section, progesterone and oestrogen in combination inhibited only the increase in milk yield. These results suggest that progesterone withdrawal initiates lactogenesis in the ewe.

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“…Lactation curves of domestic ewes suckling twins remained substantially above those for ewes suckling singletons (Butterworth et al 1968) because singletons were not able to consume all the milk that could be produced in the early stages of lactation (see Wallace 1948). Actual level of milk production of a ewe would thus be strongly influenced by the capacity of the lamb to consume milk.…”

Section: Birth Size and Body Growthmentioning

confidence: 99%

Suckling, weaning, and growth in captive woodland caribou

Lavigueur¹,

Barrette²

1992

Can. J. Zool.

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LAVIGUEUR, L., and BARRETTE, C. 1992. Suckling, weaning, and growth in captive woodland caribou. Can. J. Zool. 70:1753 -1766. To delimit the different stages of the weaning process and to understand the relationship between suckling and growth, the evolution of suckling performance and mother -young interactions associated with milk transfer was closely monitored in a group of woodland caribou (Rangifer tarandus caribou) from birth up to 160 days. Suckling rate and total suckling time dropped rapidly during the first 20 days and slowly thereafter, while suckle duration remained stable during the first 20 days and decreased gradually thereafter. In the first 20 days of life, suckling success declined from 90 to 50%, the proportion of suckles terminated by the mother increased from 30 to 90%, and the proportion of suckles with bunting increased from 40 to almost 100%. The mother licked the calf in 70% of the suckles from birth to 20 days, 40% from 20 to 40 days, and less than 20% subsequently. Suckles with licking were longer than suckles without licking during the first 30 days of life. Suckling was initiated by the calf in more than 80% of the suckles, even in the first days of life. No sex differences were found at any age for any of the behavioral variables measured. Birth weights and growth rates of males from 0 to 45 days, however, were higher than those of females. Growth rates from birth to 45 days were positively correlated with suckling rate during the first 35 days. From 46 to 100 days, growth rates were positively correlated with time spent feeding on pelleted ration and on hay. We suggest that metabolic weaning could begin at around 15 -20 days, when suckling success and the mother's contribution to establishing and maintaining suckling interactions decreased most steeply. The end of metabolic weaning could occur at 40-45 days, when suckling rate, suckling success, and the mother's contribution to suckling reached low values from which they declined very slowly to the end of behavioral weaning. Behavioral weaning was not yet completed at the age of 160 days. LAVIGUEUR, L., et BARRETTE, C. 1992. Suckling, weaning, and growth in captive woodland caribou. Can. J. Zool. 70 : 1753 -1766. Pour tenter de delimiter les differentes phases du processus de sevrage et pour comprendre la relation entre l'allaitement et la croissance, des mesures fines de la performance d'allaitement ont etC effectuees chez un groupe de Caribous des bois (Rangifer tarandus caribou), de la naissance a 160 jours. La frequence et la duree totale des allaitements ont baisse rapidement au cours des 20 premiers jours, et trks lentement par la suite, alors que la durte moyenne des allaitements est deme;rte relativement constante pendant cette periode et a ensuite diminue graduellement. De la naissance a 20 jours, le succks de I'allaitement a baisse de 90 a 50% et la proportion des allaitements terminks par la mkre a augment6 de 30 a 90%. Le lechage du faon par la mkre, qui etait observe dans 70% des allaitements de 0 a 20 jours, se produis...

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Some observations on the lactation of Blackhead ewes and the growth of lambs: the composition and yield of milk

Cited by 12 publications

References 10 publications

Relationships between Ewe Milk Production and Composition and Preweaning Lamb Weight Gain

Relationships between Ewe Milk Production and Composition and Preweaning Lamb Weight Gain

Progesterone and Oestrogen and the Initiation of Lactation in Ewes

Suckling, weaning, and growth in captive woodland caribou

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