Effect of extended lactations on cow milk and reproductive performance

Sawa, Anna; Bogucki, M.

doi:10.5194/aab-52-219-2009

Cited by 6 publications

(4 citation statements)

References 6 publications

(3 reference statements)

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“…In this study, parity did not influence lactation length, which is not in line with previous studies indicating that cow's age (lactation number) is a strong factor influencing the proportion of extended lactations (Sawa and Bogucki, 2009), seemly due to a higher persistence observed in primiparous compared to pluriparous cows (Miller et al, 2006). However, in line with previous studies (López et al, 2015), primiparous cows presented a higher persistence than multiparous cows, which indicates that lactation length was primarily influenced by earlier pregnancy of cows rather than parity.…”

Section: Discussioncontrasting

confidence: 84%

Impact of frequency of milking on milk yield and fertility of Holstein cows undergoing extended lactations due to failure to conceive

et al. 2021

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The objective of this observational study was to determine the effect of two (2x) compared to three (3x) times a day milking in Holstein cows undergoing lactations ≥600 d on milk production and reproductive performance. Two large adjacent commercial dairy herds with similar size, facilities, and management in a hot area of northern Mexico (25° N) were used. Cows in one herd (n= 214) were milked two times a day (2x), the other herd was milked three times a day (3x; n=245) and both groups were milked for at least 600 days. For cows in first lactation, total milk yield did not differ between 3x and 2x cows (19796 ± 3354 vs. 19269 ± 3652 kg; p > 0.10) in lactations with an average of 696 and 650 days in milk (DIM), respectively. Multiparous 3x cows produced more total milk days than 2x cows (20942 ± 3920 vs. 18910 ± 2632 kg; p < 0.01) with greater (p < 0.01) DIM for 3x (685 ± 117 days) than 2x (631 ± 88 days) cows. Lactation persistence was greater (p < 0.05) in 2x (62 ± 9%) than 3x (60 ± 10%) cows. Overall conception rate (CR) did not differ between 2x and 3x cows (53.3% vs. 49.8%) but 3x cows required one more service (p < 0.01) to get pregnant than 2x animals. Given that average milk yield throughout the complete lactation did not differ between 2x (29.8 ± 2.0 kg) and 3x (29.3 ± 2.9 kg) cows, it was concluded that two-times-a-day milking is equally effective as three-times-a-day milking to attain acceptable milk yield in lactations over 600 days. However, reproductive performance based on first-service CR and services per pregnancy was negatively affected by three-times-a-day milking.

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Section: Discussioncontrasting

confidence: 84%

Impact of frequency of milking on milk yield and fertility of Holstein cows undergoing extended lactations due to failure to conceive

et al. 2021

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“…Higher milk yields increased changes in cow productivity, among others by extending lactations. It is therefore necessary to revise the length of the dry period which, according to the current management strategy for a dairy herd should be 6-8 weeks long with the optimum, 305-day lactation (Guliński et al 2004, Salamończyk & Guliński 2007, Sawa & Bogucki 2009). Lormore & Galligan (2001) found a negative effect of drying high-yielding cows (with daily milk yield during the dry period often exceeding 30 kg) on their health status (metabolic disorders, fatty liver, ketosis, periparturient hypocalcemia).…”

Section: Introductionmentioning

confidence: 99%

Dry period length and performance of cows in the subsequent production cycle

2012

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The effect of dry period length on performance in the next production cycle was investigated in the active population of cows from the Pomerania and Kuyavia regions of Poland. Dry length period of the cows was calculated and classified (0, 1-20, 21-40, 41-60, 61-80, 81-100, >100 days). The GLM, FREQ and CORR PEARSON procedures of the SAS package 9.1 were used in the statistical calculations. The problem of dry period length was found to be debatable. A dry period of 40-60 days would be the most favourable in terms of milk, fat and protein yield in the next lactation, the course of parturition and the proportion of calves born alive, and a dry period of 21-60 days would be the most beneficial in terms of the proportion of cows surviving the next production cycle. Extending or shortening the standard dry period of 40-60 days by 20 days causes a slight decrease in performance determined by the above parameters, whereas extending and especially shortening the dry period by another 20 days, or the absence of a dry period, have a severely negative effect. Compared to cows that had been dry for 40-60 days, the cows whose calving was not preceded by a dry period had lower lactation yield (by 25 % for milk, by 24 % for fat and by 20 % for protein), lower daily milk yield (by 22 %), were significantly more prone to miscarriage, and more frequently gave birth to dead calves, calves with physical defects or grossly malformed calves. Too long a dry period (beyond 100 days) may carry a risk of higher culling levels in the herd, shorter lactations, health abnormalities, and poorer reproductive performance.

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“…Therefore, it is generally not possible to distinguish a voluntary extension of the VWP from poor fertility, e.g., inability of the cow to show estrus or to conceive. This may lead to the somewhat biased conclusion that extended CInt is the cause of poor fertility (Sawa & Bogucki, 2009;Mellado et al 2016). It is possible to draw conclusions about correlations between factors, but perhaps less so regarding causality in this type of study.…”

Section: Retrospective Studiesmentioning

confidence: 97%

Extended voluntary waiting period before first insemination in primiparous dairy cows : effects on milk production, fertility, and health

Edvardsson Rasmussen

2023

Acta Universitatis Agriculturae Sueciae

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Extension of the voluntary waiting period (VWP) before first insemination after calving, could decrease the frequency of demanding transition periods both at cow and herd level. In the initial study of this thesis, the cows were randomized to an extended (155-205 d) or conventional (35-85 d) VWP and assessed during their first and second lactation. In a later study on customized extended VWP, cows expected to be suited for extended VWP were selected based on high genomic persistency index, calving difficulties or disease in early lactation, and high early lactation yield, and then randomly allocated to extended (≥185) or conventional (≤90) VWP. For cows with randomized extended compared with conventional VWP, milk yield per day in the calving interval was maintained during the first lactation and higher during the second lactation, milk yield before dry-off was lower and reproductive performance was improved. Cows with customized extended VWP showed similar improvements compared with cows expected to be suited for an extended but receiving conventional VWP, but in contrast to the randomized study, the dry period was not longer for cows randomized to customized extended VWP. Extending the VWP had no effect on disease incidence and culling rate. Extended VWP for primiparous cows in high-yielding herds can thus make use of modern dairy cows’ great potential for milk production and fertility, thereby potentially increasing flexibility and resilience in dairy herds.

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Effect of extended lactations on cow milk and reproductive performance

Cited by 6 publications

References 6 publications

Impact of frequency of milking on milk yield and fertility of Holstein cows undergoing extended lactations due to failure to conceive

Impact of frequency of milking on milk yield and fertility of Holstein cows undergoing extended lactations due to failure to conceive

Dry period length and performance of cows in the subsequent production cycle

Extended voluntary waiting period before first insemination in primiparous dairy cows : effects on milk production, fertility, and health

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