Effect of stress on somatic cell count and milk yield and composition in goats

Mehdid, Amine; Olives, Ana Martí-De; Fernández, N.; Rodríguez, M.; Peris, C.

doi:10.1016/j.rvsc.2019.05.015

Cited by 20 publications

(13 citation statements)

References 33 publications

(47 reference statements)

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“…Furthermore, the cumulative effect of challenges led to a significant decrease in milk yield during the last challenge (on day 154 of lactation) and on subsequent days of lactation (on days 155, 160, and 161 of lactation) when compared to control goats (Figure 1). Other studies have associated cortisol and SCC increases with an increase in the apoptosis rate in mammary glands and a consequent increase in the number of mammary epithelial cells in the milk of stressed animals (Romero et al, 2015;Mehdid et al, 2019). However, as cortisol is considered an immunosuppressor, the higher SCC observed in the present study cannot be explained by an increase in defense cells in milk (Gonçalves et al, 2017).…”

Section: Table 2 Effect Of Treatment (T) Sampling Hour (H) and Their ...contrasting

confidence: 52%

Cumulative effect of different acute stressors on physiological and hormonal responses and milk yield in lactating Saanen goats

Vasconcelos

Silva²,

Merighe³

et al. 2022

Semina: Ciênc. Agrár.

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This study addresses the hypothesis that acute stress can cumulatively cause a decrease in milk yield in Saanen goats. In fact, dairy animals are subject to several environmental and management challenges that may cause acute stress during the same lactation. However, the cumulative effect of acute stress on milk yield remains unclear. Thus, the objective of this study was to evaluate the effects of different acute stressors on milk yield and milk quality in goats. Thirty Saanen goats were either maintained on their usual routine and comfort conditions (control group) or subjected to different environmental stressors (heat stress, adrenocorticotropic hormone [ACTH] administration, hoof care, and rain). These stressful challenges were performed sequentially, one challenge per day, on four consecutive days to evaluate the influence of the challenge on milk yield and milk quality. The acute stress imposed on goats caused significant changes in respiratory rate, rectal temperature, cortisol, insulin, triiodothyronine, insulin-like growth factor 1, and glucose concentrations when compared to the control group. Although these acutestress-triggered physiological responses are fundamental to restoring homeostasis, the cumulative effects of different imposed challenges caused a change in hormone release, an increase in somatic cell count (SCC), and a decrease in milk yield. In this context, the results of this study indicate that farmers should avoid concurrently subjecting goats to management and environmental challenges that can induce acute stress because these stressors have a negative and cumulative impact on SCC and milk yield.

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Section: Table 2 Effect Of Treatment (T) Sampling Hour (H) and Their ...contrasting

confidence: 52%

Cumulative effect of different acute stressors on physiological and hormonal responses and milk yield in lactating Saanen goats

Vasconcelos

Silva²,

Merighe³

et al. 2022

Semina: Ciênc. Agrár.

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“…In contrast, milk yield and composition of VTs does were not affected, remaining similar to the NC group. Increased SCC levels in VTc and FT milk suggest poorer breast health condition and milk quality in these groups [55]. Thus, overall results indicated that a more reduced lactation performance was exhibited by FT and VTc does compared to the NC group, leaving that of the VTs unaltered.…”

Section: Discussionmentioning

confidence: 80%

Developmental Plasticity in Response to Embryo Cryopreservation: The Importance of the Vitrification Device in Rabbits

García‐Domínguez

Vicente

Marco‐Jiménez

2020

Animals

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In this study, we evaluated the effect of embryo vitrification using two different devices on adulthood phenotype in rabbits. In vitro development, prenatal embryo survival, body weight, growth performance, haematological and biochemical peripheral blood analysis, reproductive performance, and lactation performance traits were compared between the experimental groups. They derived from naturally-conceived embryos (NC), fresh-transferred embryos (FT), vitrified-transferred embryos using mini-straw (VTs), or vitrified-transferred embryos using Cryotop (VTc). Straw-vitrified embryos exhibited lower in vitro developmental rates and in vivo survival rates following embryo transfer compared to its Cryotop-vitrified counterparts. Moreover, the VTs group exhibited higher foetal losses than VTc, FT, and NC groups. Independently of the vitrification device, vitrified-transferred (VT) offspring showed a skewed sex ratio in favour of males, and an increased birth bodyweight. In contrast, postnatal daily growth was diminished in all ART (i.e., FT and VT) animals. In adulthood, significant differences in body weight between all groups was founded—all ART progenies weighed less than NC animals and, within ART, VT animals weighed less than FT. For VT groups, weight at adulthood was higher for the VTs group compared with the VTc group. Peripheral blood parameters ranged between common values. Moreover, no differences were found in the fertility rates between experimental groups. Furthermore, similar pregnancy rates, litter sizes, and the number of liveborns were observed, regardless of the experimental group. However, decreased milk yield occurred for VTc and FT animals compared to VTs and NC animals. A similar trend was observed for the milk composition of dry matter and fat. Concordantly, reduced body weight was found for suckling kits in the VTc and FT groups compared to VTs and NC animals. Our findings reveal that developmental changes after the embryo vitrification procedure could be associated with an exhibition of the embryonic developmental plasticity. Moreover, to our best knowledge, this study reports the first evidence demonstrating that the vitrification device used is not a trivial decision, providing valuable information about how the cooling–warming rates during vitrification can be partly responsible of the postnatal phenotypic variations.

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“…distribution (disregarding SCC) is similar in L and H group (27.3–35.3%, Table 3 ). Higher SCC levels in our study might have been caused by factors other than MCB, e.g., the animal’s physiology, genotype [ 27 ], or by other non-infectious factors such as estrus, seasonal influences, or parity [ 28 , 29 ]. External stresses experienced by the animal can also influence milk SCC [ 2 , 29 ].…”

Section: Resultsmentioning

confidence: 99%

Somatic Cell Count in Goat Milk: An Indirect Quality Indicator

Podhorecká

Borková²,

Šulc

et al. 2021

Foods

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A high somatic cell count (SCC) impacts dairy quality to a large extent. The goal of this work was to investigate differences in goat milk composition and technological parameters according to SCC cut-off (600, 700, 800, and 1000.103/mL). Thirty-four individual milk samples of White Shorthair goats in a similar stage of lactation were investigated. The first differences in milk quality appeared already at SCC cut-off of 600.103/mL (5.58 LSCS-linear somatic cell score), yet the most striking differences were found for SCC over 1000.103/mL (6.32 LSCS), which was expressed by lowering heat stability (126 vs. 217 s, p = 0.034), increasing protein (3.41 vs. 3.04%, p = 0.009), casein (2.80 vs. 2.44%, p = 0.034) and chloride (164 vs. 147 mg/100 mL, p = 0.004) levels, as well as non-fat dry matter (8.79 vs. 8.45%, p = 0.045). It has been shown that low levels of Staphylococcus spp. bacteria (120–1600 CFU/mL) in the mammary gland correlated with decreased lactose content (4.60 vs. 4.47 g/100 g, p = 0.022). Since our results indicate that even low SCC values may significantly affect the technological properties of goat milk, SCC should therefore be routinely screened and reported to dairy manufacturers to assure the consumer of high end-product quality.

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Effect of stress on somatic cell count and milk yield and composition in goats

Cited by 20 publications

References 33 publications

Cumulative effect of different acute stressors on physiological and hormonal responses and milk yield in lactating Saanen goats

Cumulative effect of different acute stressors on physiological and hormonal responses and milk yield in lactating Saanen goats

Developmental Plasticity in Response to Embryo Cryopreservation: The Importance of the Vitrification Device in Rabbits

Somatic Cell Count in Goat Milk: An Indirect Quality Indicator

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