Influence Saisonnière Sur La Production Et La Composition Du Lait

Decaen, C.; Journet, M.; Manis, Y.; Marquis, B.

doi:10.1051/animres:19660304

Cited by 8 publications

(4 citation statements)

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“…However, such seasonal effects are known to exist in other species. In cattle, milk yield is higher after calving in spring than in other seasons (Decaen and Journet 1966) and in goats, Linzell (1973) observed seasonal oscillations in the rate of milk secretion.…”

Section: Distal Part: End Oj Gestation and Lactationmentioning

confidence: 97%

Seasonality of Reproduction in Sheep and its Control by Photoperiod

Ortavant¹,

Bocquier²,

Pelletier³

et al. 1988

Aust. Jnl. Of Bio. Sci.

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Seasonality of the reproductive cycle in sheep is a general phenomenon for mid-latitude breeds. The proximal part (breeding season) and also partially distal part (end of gestation and beginning of lactation) of this cycle is controlled by photoperiod, whatever the form of light regimens. Data are presented which indicate that male and female do not necessarily have the same photoperiodic sensitivity. Gonadal stimulation in the ram starts 1'5-2 months earlier than in the ewe under annual variations. Photoperiod controls the reproductive cycle by the intermediary of the hypothalamo-pituitary axis. There are both a steroidindependent and a steroid-dependent effect of light, depending on both decreasing and increasing daylength in mid-latitudes.

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Section: Distal Part: End Oj Gestation and Lactationmentioning

confidence: 97%

Seasonality of Reproduction in Sheep and its Control by Photoperiod

Ortavant¹,

Bocquier²,

Pelletier³

et al. 1988

Aust. Jnl. Of Bio. Sci.

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“…The seasonal variations which change the proportions of these acids, especially in spring (Decaen and Journet, 1966;Gray, 1973;Masson et al, 1978), affect the Swisstype cheese ripening. Poor eye formation and lower levels of propionic and acetic acids in the curd suggest a poor propionic acid bacteria activity.…”

Section: Introductionmentioning

confidence: 99%

Effects of free fatty acids on propionic acid bacteria

Boyaval

Corre

Dupuis

et al. 1995

Lait

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Summary -The seasonal variations in milk fat composition, especially du ring the grazing period, often lead to poor eye formation in Swiss-type cheese. The influence of free fatty acids on the grow1h and metabolism of the dairy propionibacteria has been studied in this work. Linoleic (C 1B : 2 ), laurie (C 12 : 0 ), myristic (C14:0) and oleic acids (C1B:1) inhibited the growth and acid production of P treudenreichii subsp shermanii in the reference medium. The antibacterial activity of Iinoleic acid can be overcome by additions of cholesterol and soya lecithin to the medium. The four species and !WO subspecies of dairy Propionibacterium could be divided into !WO groups according to their high susceptibility to unsaturated fatty acids (P freudenreichii subsp shermanii and subsp freudenreichit) or low susceptibility (P acidipropionici, P jensenii and P thoeniJ). Nevertheless, this inhibitory action of free fatty acids was not observed in milk, retentate media or lactic curd. A total extraction of the milk lipids led to the recovery of this inhibitory effect on Propionibacterium. The possible modes of action of these molecules are discussed on the basis of the observed potassium effluxes and disturbances in the cell membranes.

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“…However, in addition to these factors, it has been suspected for a long time that there is a seasonal influence as well, although this is not universally recognized or established. Two recent publications quote the earlier literature and present strong circumstantial evidence for the influence of the seasons on milk secretion in cows (Decaen & Journet, 1966;Lampo, Willems & Vanschoubroek, 1966). The chief method of study has been a statistical analysis of milk yield curves, generally of groups of animals.…”

Section: Introductionmentioning

confidence: 99%

Innate seasonal oscillations in the rate of milk secretion in goats

Linzell¹

1973

The Journal of Physiology

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SUMMARY1. When goats were kept in continuous milk production for 2-4 yr the rate of milk secretion oscillated in a sinusoidal fashion with a mean wavelength of 49-7 + 1 weeks, being highest in summer and lowest in winter.2 3. There were no seasonal oscillations in body weight but the udders were larger in summer than in winter although this did not solely account for the changes in milk yield.4. Although the autumnal fall in yield and the rise in the spring coincided with the breeding season, seasonal variations also occurred in two ovariectomized animals.5. Seasonal fluctuations were independent of diet, occurring equally in animals that had never eaten grass but were fed continuously on dry feed and hay ad libitum.6. Annual oscillations in yield and udder size but not [protein] and [Cl] were also exhibited in two goats kept in a constant temperature chamber at 14 + 2°, fed every 2 hr and subjected continuously to 16 hr light and 8 hr dark. These observations have so far persisted for 2 yr in one goat and for 3 yr in the other. However, the wave-length was reduced to 45 + 1 weeks. Oestrus was suppressed for 2 years.

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Influence Saisonnière Sur La Production Et La Composition Du Lait

Cited by 8 publications

References 0 publications

Seasonality of Reproduction in Sheep and its Control by Photoperiod

Seasonality of Reproduction in Sheep and its Control by Photoperiod

Effects of free fatty acids on propionic acid bacteria

Innate seasonal oscillations in the rate of milk secretion in goats

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