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Temporal trends in reproductive performance in Irish dairy herds and associated risk factors.

Mee JF - Ir Vet J (2004)

Bottom Line: The principal components of this trend have been an increased incidence of postpartum endocrinopathies, reduced expression of oestrus and a fall in conception rate.Significant risk factors associated with these trends have been strain substitution within the Holstein-Friesian breed and single trait selection for milk production.These phenotypic trends were attributed to both genetic and environmental factors and their interactions.

View Article: PubMed Central - HTML - PubMed

Affiliation: Teagasc, Dairy Production Research Department, Dairy Production Research Centre, Moorepark, Fermoy, Co Cork, Ireland. jmee@moorepark.teagasc.ie.

ABSTRACT
: Irish dairy herd fertility has been declining since the 1980s. The extent, nature and causes of this decline in fertility and the current status of Irish dairy herd fertility were described. An increase in calving interval of approximately one day per year has been recorded. The principal components of this trend have been an increased incidence of postpartum endocrinopathies, reduced expression of oestrus and a fall in conception rate. Both submission rate and calving-to-service interval have increased slightly over time. Significant risk factors associated with these trends have been strain substitution within the Holstein-Friesian breed and single trait selection for milk production. Critically, these changes have been reflected in loss of body condition. Contributory factors included increased herd size and possibly increased use of DIYAI. The most recent Irish study showed that 48% of cows conceived to first service and 14% of cows were not pregnant at the end of the industry-average 15-week spring breeding season. However, the top quartile of herds achieved a first-service conception rate of 59%, illustrating the wide variation between herds. These phenotypic trends were attributed to both genetic and environmental factors and their interactions. Recent Irish dairy herd fertility performance falls short of the targets set for seasonal compact calving.

No MeSH data available.


Related in: MedlinePlus

Calving rate to first service in DairyMIS herds, 1991 to 1998. (Source: [43]).
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Figure 1: Calving rate to first service in DairyMIS herds, 1991 to 1998. (Source: [43]).

Mentions: The first indication of a significant decline in Irish dairy herd fertility was detected in a retrospective analysis of data from Teagasc research herds. The highest conception rate to first service was recorded in 1980 as 67% and it declined to 59% in 1988 [25]. Subsequent studies in commercial herds in the 1990s confirmed this phenotypic trend (Figure 1) when calving rate to first service declined significantly by 0.7% to 0.9% per year [52,43]. However, the decline in calving rate to all services was smaller (0.5% per year: [43]).


Temporal trends in reproductive performance in Irish dairy herds and associated risk factors.

Mee JF - Ir Vet J (2004)

Calving rate to first service in DairyMIS herds, 1991 to 1998. (Source: [43]).
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3113820&req=5

Figure 1: Calving rate to first service in DairyMIS herds, 1991 to 1998. (Source: [43]).
Mentions: The first indication of a significant decline in Irish dairy herd fertility was detected in a retrospective analysis of data from Teagasc research herds. The highest conception rate to first service was recorded in 1980 as 67% and it declined to 59% in 1988 [25]. Subsequent studies in commercial herds in the 1990s confirmed this phenotypic trend (Figure 1) when calving rate to first service declined significantly by 0.7% to 0.9% per year [52,43]. However, the decline in calving rate to all services was smaller (0.5% per year: [43]).

Bottom Line: The principal components of this trend have been an increased incidence of postpartum endocrinopathies, reduced expression of oestrus and a fall in conception rate.Significant risk factors associated with these trends have been strain substitution within the Holstein-Friesian breed and single trait selection for milk production.These phenotypic trends were attributed to both genetic and environmental factors and their interactions.

View Article: PubMed Central - HTML - PubMed

Affiliation: Teagasc, Dairy Production Research Department, Dairy Production Research Centre, Moorepark, Fermoy, Co Cork, Ireland. jmee@moorepark.teagasc.ie.

ABSTRACT
: Irish dairy herd fertility has been declining since the 1980s. The extent, nature and causes of this decline in fertility and the current status of Irish dairy herd fertility were described. An increase in calving interval of approximately one day per year has been recorded. The principal components of this trend have been an increased incidence of postpartum endocrinopathies, reduced expression of oestrus and a fall in conception rate. Both submission rate and calving-to-service interval have increased slightly over time. Significant risk factors associated with these trends have been strain substitution within the Holstein-Friesian breed and single trait selection for milk production. Critically, these changes have been reflected in loss of body condition. Contributory factors included increased herd size and possibly increased use of DIYAI. The most recent Irish study showed that 48% of cows conceived to first service and 14% of cows were not pregnant at the end of the industry-average 15-week spring breeding season. However, the top quartile of herds achieved a first-service conception rate of 59%, illustrating the wide variation between herds. These phenotypic trends were attributed to both genetic and environmental factors and their interactions. Recent Irish dairy herd fertility performance falls short of the targets set for seasonal compact calving.

No MeSH data available.


Related in: MedlinePlus