Human contact and the effects of acute stress on cows at milking

Rushen, J.; Munksgaard, Lene; Marnet, Pierre‐Guy; DePassillé, A.M

doi:10.1016/s0168-1591(01)00105-8

Cited by 165 publications

(138 citation statements)

References 37 publications

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“…Additionally, all experimental groups produced milk at levels comparable with those described by other authors [7,20], and the Gir and GirHol groups did not exhibit a high percentage of residual milk as described for other zebu breeds [15] or for dairy cows submitted to different situations of stress [7,32] or during first milkings after parturition [6,16]. This confirms that CORT levels alone are often poor predictors of stress in lactating animals as reported by other research [33] and suggests that, if stress exists in Gir cows, it is not very acute and only concerns some animals in the group.…”

Section: Discussionsupporting

confidence: 81%

Milk yield, residual milk, oxytocin and cortisol release during machine milking in Gir, Gir × Holstein and Holstein cows

Negrão¹,

Marnet²

2006

Reprod. Nutr. Dev.

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-This study evaluated the effect of exclusive machine milking on oxytocin (OT) and cortisol (CORT) release, and on milk yield and residual milk in Gir (group Gir), Holstein (group Hol) and crossbred animals (group GirHol). Six animals from each group were submitted to experimental milkings. As expected, milk yield was significantly higher in the Hol group than in the groups GirHol and Gir, and group GirHol produced more milk than the Gir group. In contrast, all groups exhibited significant but similar levels of OT, although OT increased more rapidly during milking for the groups Hol and GirHol than for the Gir group. In addition, CORT levels measured during and after milking were significantly influenced by the group. The Gir group showed higher levels of CORT than the groups GirHol and Hol. The lower performances of the Gir breed can not be explained by a less efficient milk ejection reflex because all cows studied released enough OT and had an effective milk ejection.zebu / crossbred / milking / oxytocin / cortisol

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Section: Discussionsupporting

confidence: 81%

Milk yield, residual milk, oxytocin and cortisol release during machine milking in Gir, Gir × Holstein and Holstein cows

Negrão¹,

Marnet²

2006

Reprod. Nutr. Dev.

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“…Desse modo, o grupo que recebeu ACTH apresentou um mesmo modelo de liberação de cortisol nos três dias de desafio, com valores de cortisol superiores aos do grupo placebo, o que indica que houve estímulo da adrenal pelo ACTH (Escobar et al, 1998;Negrão et al, 2004;Delgado, 2008). Tanto o perfil quanto o aumento nos níveis de cortisol mensurados nas cabras experimentais que receberam ACTH foram próximos àqueles observados após a indução de diferentes agentes estressores, seja em cabras (Escobar et al, 1998;Duvaux-Ponter et al, 2003;Delgado, 2008;Canaes et al, 2009; Canaes e Negrão, 2009), em ovelhas (Fulkerson e Jamieson, 1982;Marnet e Negrão, 2000) ou em vacas (Tancin et al, 1995;Rushen et al, 2001;Negrão et al, 2004;Negrão, 2008 Também não houve diferenças na distribuição dos valores médios de proteína no leite durante o estresse pontual por três dias consecutivos. Cabras submetidas ao estresse via transporte e com aumento dos níveis de cortisol também não apresentaram mudanças nos teores de proteína do leite (Canaes e Negrão, 2009).…”

Section: Resultsunclassified

Qualidade e quantidade do leite produzido por cabras da raça Saanen submetidas a estresse por três dias consecutivos

Gaiato

Delgado

Negrão

2012

Arq. Bras. Med. Vet. Zootec.

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“…In fact, plasma CORT concentration after ACTH administration is an appropriate characteristic to study stress response in dairy animals (Fulkerson & Jamieson 1982;Negrão et al 2010). Interestingly, many authors have associated a similar increase in CORT with different kinds of stress (Rushen et al 2001;Negrão & Marnet 2006), including heat stress (Satterlee et al 1977;Du Preez 2000).…”

Section: Acth Administrationmentioning

confidence: 99%

Heat stress and ACTH administration on cortisol and insulin-like growth factor I (IGF-I) levels in lactating Holstein cows

Titto

Negrão

Canaes

et al. 2015

Journal of Applied Animal Research

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Physiological and productive responses were studied in five Holstein cows in thermal comfort (T1), stress by exogenous adrenocorticotropic hormone (ACTH) administration (T2) and heat stress (T3) to compare acute and punctual stress (ACTH) and prolonged stress (heat stress). During T1 and T2, cows were housed in a climatic-free stall barn. In T3, the animals were kept in a climatic room (air temperature of 37°C from 08:00 to 13:00 h, and of 26°C from 14:00 to 07:00 h) for 7 days. Milk yield, rectal temperature (RT), respiratory rate (RR) and blood samples were obtained before, during and after all treatments. In T1 at 08:00 h, RT and RR were below the upper critical limit. Simultaneously, cortisol and insulin growth-factor I (IGF-I) were within the normal limits. After ACTH administration (T2), cortisol significantly increased, reaching maximum levels at 60 min and returning to basal levels at 300 min. However, IGF-I was not affected. During T3, Holstein cows did not effectively dissipate their body temperature and RT, RR and cortisol significantly increased. There was a 26.6% reduction in milk production after heat stress (P < .05). Prolonged heat stress was more stressful and cows had higher levels of CORT in T3 than in T2 even before the increase in body temperature. Although the total amount of cortisol and IGF-I presented a negative and significant Pearson correlation (r = −0.79), IGF-I was not significantly influenced by heat stress or ACTH administration, and the relationship between IGF-I and heat stress remains controversial. ARTICLE HISTORY

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Human contact and the effects of acute stress on cows at milking

Cited by 165 publications

References 37 publications

Milk yield, residual milk, oxytocin and cortisol release during machine milking in Gir, Gir × Holstein and Holstein cows

Milk yield, residual milk, oxytocin and cortisol release during machine milking in Gir, Gir × Holstein and Holstein cows

Qualidade e quantidade do leite produzido por cabras da raça Saanen submetidas a estresse por três dias consecutivos

Heat stress and ACTH administration on cortisol and insulin-like growth factor I (IGF-I) levels in lactating Holstein cows

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