Oxytocin and milk removal: two important sources of variation in milk production 
and milk quality during and between milkings

Lollivier, Vanessa; Guinard-Flament, Jocelyne; Ollivier-Bousquet, Michèle; Marnet, Pierre‐Guy

doi:10.1051/rnd:2002016

Cited by 48 publications

(44 citation statements)

References 85 publications

(108 reference statements)

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“…Moreover, there was a relationship within groups between total OT release and milk yield, confirming that high OT levels are necessary for complete milk ejection [27,28], and also that OT could act directly on mammary epithelial cells in intracellular transport and secretion as suggested by other authors [29].…”

Section: Discussionsupporting

confidence: 79%

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: 79%

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 alternation of long and short milking intervals might also explain the higher milk yield (1.9 kg for the three experiments pooled; P 5 0.08) recorded after the longest milking intervals in the TDM groups (19 h to 21.5 h) compared with the 24 h interval in ODM. The doubled number of milkings in the TDM schedule compared with ODM may have supported the activity of mammary tissue more through hormonal action (see Lollivier et al (2002) and Boutinaud et al (2004)). …”

Section: Milk Yieldmentioning

confidence: 99%

Performance of dairy cows milked twice daily at contrasting intervals

Rémond

Pomiès

Julien³

et al. 2009

Animal

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The time constraints of the classic twice-daily milking routine are less easily endured by individual dairy farmers, because of their impact on quality of life. Our aim was to evaluate milk production responses by dairy cows milked twice daily at contrasting intervals. In experiments 1 (20 cows) and 2 (28 cows), four milking regimes were compared during a 3-week period beginning after the peak of lactation. Three groups of five cows were milked twice daily (TDM) with milking intervals of 11 : 13, 7 : 17 and 3 : 21 h in experiment 1, and three groups of seven cows at 11 : 13, 5 : 19 and 2.5 : 21.5 h in experiment 2. One group (five and seven cows respectively) was milked once daily (ODM) in each experiment. In experiment 3 (three groups, 12 cows per group), one group was milked at 10 : 14 h and one at 5 : 19 h, and the third group once daily. Milking treatments began during the second week of lactation and continued for an average of 23 weeks. In experiments 1 and 2, daily milk yields were reduced by 4.1%, 11.5% and 28%, for the 5 : 19, 3 : 21 and ODM milking treatments compared with the 11 : 13 h interval. In experiment 3, the decrease in daily milk yields for 5 : 19 h and ODM was 10% and 40% compared with the 10 : 14 h time interval. In the average daily milk, fat and protein contents and somatic cell counts were not different between the TDM groups, and the ODM group had (or tended to have) a higher fat and protein content. For a given milking, milk fat content decreased from about 60 to 32 g/kg as the preceding milking interval increased from 2.5 to 3 h up to 12 h. It then levelled out and even increased, mainly after 18 to 20 h. Somatic cell count showed a similar trend, and protein content did not change steadily. Dry matter intake, body weight and body condition score were not affected by contrasting milking intervals. After resumption of TDM with conventional intervals, productions of milk, fat and protein no longer differed between the TDM groups. Milk yield of previously ODM cows remained lower by 2 kg/day ( P 5 0.15) in experiments 1 and 2, and by 7 kg/day ( P , 0.05) in experiment 3. These results suggest that TDM at contrasting intervals up to 5 : 19 h is feasible as it decreases milk yield only moderately, especially if implemented from peak of lactation.

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“…The variations among the pregnancy test results cannot be justified by the time wherein the data were collected (beginning of milking or from the milk meter) because, as described by Lollivier et al (2002), protein and lactose levels did not show variation during milking, unlike fat levels. Thus, samples collected at the beginning or end of the milking must have similar levels of proteins and, consequently, PAG.…”

Section: Resultsmentioning

confidence: 99%

Short communication: Bovine milk sampling efficiency for pregnancy-associated glycoproteins (PAG) detection test

Silva

Cassoli

Pantoja

et al. 2017

Span. j. agric. res.

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Two experiments were conducted to verify whether the time of day at which a milk sample is collected and the possible carryover in the milking system may affect pregnancy-associated glycoproteins (PAG) levels and, consequently, the pregnancy test results in dairy cows. In experiment one, we evaluated the effect of time of day at which the milk sample is collected from 51 cows. In experiment two, which evaluated the possible occurrence of carryover in the milk meter milking system, milk samples from 94 cows belonging to two different farms were used. The samples were subjected to pregnancy test using ELISA methodology to measure PAG concentrations and to classify the samples as positive (pregnant), negative (nonpregnant), or suspicious (recheck). We found that the time of milking did not affect the PAG levels. As to the occurrence of carryover in the milk meter, the PAG levels of the samples collected from Farm-2 were heavily influenced by a carryover effect compared with the samples from Farm-1. Thus, milk samples submitted to a pregnancy test can be collected during the morning or the evening milking. When the sample is collected from the milk meters, periodic equipment maintenance should be noted, including whether the milk meter is totally drained between different animals’ milking and equipment cleaning between milking is performed correctly to minimize the occurrence of carryover, thereby avoiding the effect on PAG levels and, consequently, the pregnancy test results. Therefore, a single milk sample can be used for both milk quality tests and pregnancy test.

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Oxytocin and milk removal: two important sources of variation in milk production and milk quality during and between milkings

Cited by 48 publications

References 85 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

Performance of dairy cows milked twice daily at contrasting intervals

Short communication: Bovine milk sampling efficiency for pregnancy-associated glycoproteins (PAG) detection test

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