Efecto Del Celo Y Del Estrés Sobre El Recuento De Células Somáticas en Leche De Cabra

Mehdid, Mohammed El Amine

doi:10.4995/thesis/10251/6846

Cited by 4 publications

(4 citation statements)

References 13 publications

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“…Milk cortisol concentration during lactation was higher in first-and third-parity animals. In cows, Fukasawa et al (2008) did not find significant differences in milk cortisol concentration from animals with different parities, and Mehdid (2009) points out that, in goats under the same stressful stimulation, animals of parity 3 or more can suffer greater stress than first-or second-parity goats and a higher level of plasma cortisol is noted.…”

Section: Discussionmentioning

confidence: 90%

“…Hockett et al (2000) also found a significant increase in the level of cortisol in blood at 4 and 7 d after inducing IMI with Streptococcus compared with preinfection values. In contrast, Mehdid (2009) states that if severe stress occurs, the level of cortisol in blood increases and SCC increases, although this increase in SCC is only found in goats of 3 or more parities. It is possible that because of the sampling interval in this study, we failed to identify effects of the IMI on cortisol or that the infections recorded were not serious enough to produce a significant increase in milk cortisol.…”

Section: Discussionmentioning

confidence: 98%

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Variation in milk cortisol during lactation in Murciano-Granadina goats

Díaz

Alejandro

Romero

et al. 2013

Journal of Dairy Science

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Fifty-seven goats were included in an experiment designed to study the effect of lactation stage, parity number, and mammary gland health status on milk cortisol concentration as a method to assess the welfare of Murciano-Granadina goats. The relationships of milk cortisol concentration with different production parameters (milk yield, milk composition, and mechanical milking ability: milk fractioning during milking and milking time) were also studied. The experiment lasted 8 mo and monthly samplings were carried out to determine total milk yield (MY), fractioning during milking (machine milk, MM; machine stripping milk, MSM), and milking time (MT), and a sample was taken from the total milk yield to determine milk cortisol concentration, somatic cell count, and milk composition (fat, protein, and lactose). To determine the infection status of the gland, an aseptic sample was taken for bacteriological analysis before each monthly sampling. Third-parity goats presented higher concentrations of milk cortisol than those of 1, 2, or ≥ 4 parities. Intramammary infection had no effect on milk cortisol concentration, and somatic cell count did not correlate with cortisol concentration. Cortisol presented a significant correlation with MY and MM, but showed no significant correlation with MSM, MT, or milk composition parameters. Variations in milk cortisol concentration in goats may be associated with different physiological factors in the animal (e.g., milk production level, lactation stage, and parity number) and therefore need not always indicate stress for the animal.

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Section: Discussionmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 98%

Variation in milk cortisol during lactation in Murciano-Granadina goats

Díaz

Alejandro

Romero

et al. 2013

Journal of Dairy Science

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“…Previous studies conducted both on cows and goats did not find correlation between milk cortisol concentration and the level of SCC [ 32 , 33 ]. However, according to Mehdid et al [ 34 ] and Diaz et al [ 32 ], if severe stress occurs, the concentration of cortisol in blood increases and SCC increases.…”

Section: Discussionmentioning

confidence: 99%

Factors affecting milk cortisol in mid lactating dairy cows

et al. 2015

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BackgroundWhether the measurement of cortisol in dairy cows can be used as a biomarker of adverse environmental or pathophysiological conditions is still under of scientific debate. In these situations, several systems mainly the hypothalamic-pituitary-adrenal axis, the autonomic nervous system, and the immune system are recruited to reestablish homeostasis. A first aim of the present study was to compare milk and blood cortisol concentrations and to consider its variability in milk in relation to farm, milk yield and days in milk. A second study investigates the effects of breed, class of somatic cell count (SCC) and farm on milk cortisol levels in a larger number of cows and farms, with the aim to validate the results obtained in the pilot study.MethodsFor study 1, 135 cows were sampled from 2 Italian Simmental and 2 Italian Holstein commercial farms, whilst in the second study, 542 cows were sampled from 6 commercial farms of Italian Simmental and 499 cows from 4 commercial farms of Italian Holstein.ResultsIn study 1, the values of cortisol content in milk were significantly higher in Holstein than Simmental cows. Significant differences between farms were observed for milk and plasma cortisol concentrations. Cortisol content in milk was not correlated to plasma content in study 1 and the mean milk to plasma cortisol ratio was about 1:30. In study 2, for Holstein cows, significantly higher values of milk cortisol in comparison to Simmental cows was reported. A significant effect of class of SCC was observed, cows belonging to class 3 (SCC higher than 400.000/ml) showed the highest mean values of milk cortisol. The farm effect was significant also in the study 2, confirming the results obtained in the first study.ConclusionsMilk can be considered a preferential site of sampling in dairy cows to point out short term stimulation of the hypothalamic-pituitary-adrenal axis. Further studies are needed to investigate the physiological basis of the relationship between milk cortisol content and breed, milk yield and SCC to ascertain the relevance of milk cortisol to monitor the healthy status of mammary gland.

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“…This lack of difference between treatments is in contrast to results published by Caroprese et al (2010), who observed, in an experiment in dairy ewes where animals were divided into high-cortisol and low-cortisol ewes, that SCC was higher in milk from high-cortisol ewes than in that from low-cortisol ewes. Mehdid (2009) observed that, in goats exposed to an extreme and acute stress stimulus (e.g., exposure to a dog), blood cortisol levels increased but SCC was only significantly increased in the oldest animals. In cattle, Whittlestone et al (1970) demonstrated that isolation of the animals or exposure to a dog increased SCC but that the increase was greater in animals that had a previous history of mastitis.…”

Section: Figurementioning

confidence: 96%

Within-day variation and effect of acute stress on plasma and milk cortisol in lactating goats

Romero

Restrepo

Muelas

et al. 2015

Journal of Dairy Science

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An experiment was carried out to study the effect of acute stress on cortisol concentration in goat milk (milk cortisol; MC) and its suitability for stress assessment. Additional variables studied were plasma cortisol (PC), blood glucose (BG), and somatic cell count (SCC). Ten goats free of mastitis at 2 mo of lactation were divided into 2 groups. One group of animals was exposed to acute stress (visual and auditory, but not physical, contact with a barking dog for 3 min) immediately before the 1000 h sampling (STR), and the other group was considered as the control group, not exposed to acute stress (CON). The animals were gradually accustomed to the sampling schedule for 1 wk before the stress treatment (pre-experimental period). The variables PC, MC, BG, SCC, and milk composition (fat, lactose, whey protein, true protein, and casein) were recorded at 0600, 1000, 1130, 1400, 1800, 2200, and 0200 h. Milk variables were recorded in both glands separately. The right gland (n=10) was completely milked and the left gland (n=10) was milked to 30 mL at every sampling except at 1000 h, when complete milking was carried out on both glands. Variables were analyzed by using a linear mixed model. Both PC and MC concentrations varied throughout the day, with values being highest in the morning. Higher PC levels were recorded in the STR group immediately after treatment compared with CON (36.9 vs 16.3 ng/mL). For MC, differences between treatments were noted 1.5h after STR treatment (1.27 vs 0.25 ng/mL). Blood glucose increased immediately after treatment in STR animals, being different from CON until 1.5h after treatment sampling (101 vs. 58 mg/dL). The SCC was not increased by STR treatment, showing higher values in the morning and afternoon compared with evening and night (5.6±0.13 to 5.87±0.13 log10 SCC). The STR treatment had no significant effect on milk composition, and overall milk yield of a complete day after stress stimulus of both groups was similar (STR: 2,067±280 g/d; CON: 2,134±427 g/d). We conclude that plasma and milk cortisol concentrations in control dairy goats varied throughout the day; MC showed significant differences in the STR group if samples were taken 1.5h after the stressing stimulus, whereas PC showed significant differences in samples taken immediately after the stressing stimulus. Additionally, MC sampling has the advantage of being noninvasive compared with blood sampling.

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Efecto Del Celo Y Del Estrés Sobre El Recuento De Células Somáticas en Leche De Cabra

Cited by 4 publications

References 13 publications

Variation in milk cortisol during lactation in Murciano-Granadina goats

Variation in milk cortisol during lactation in Murciano-Granadina goats

Factors affecting milk cortisol in mid lactating dairy cows

Within-day variation and effect of acute stress on plasma and milk cortisol in lactating goats

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