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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.

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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 interval in Irish milk recording herds, 1990 to 1999. (Source: [30]).
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Figure 2: Calving interval in Irish milk recording herds, 1990 to 1999. (Source: [30]).

Mentions: These trends recorded in research herds and DairyMIS herds may or may not be representative of trends in the national dairy cow population. However, they are consistent with fertility data from cows in milk recording herds during the 1990s (Figure 2). These data show an increase in calving interval of 0.9 days per year (1993: 389 days v. 1999: 395 days) and a decrease in reappearance rate between first and second lactation of 1% per year (1993:80.4% v. 1999:73.2%).


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

Mee JF - Ir Vet J (2004)

Calving interval in Irish milk recording herds, 1990 to 1999. (Source: [30]).
© Copyright Policy
Related In: Results  -  Collection

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

Figure 2: Calving interval in Irish milk recording herds, 1990 to 1999. (Source: [30]).
Mentions: These trends recorded in research herds and DairyMIS herds may or may not be representative of trends in the national dairy cow population. However, they are consistent with fertility data from cows in milk recording herds during the 1990s (Figure 2). These data show an increase in calving interval of 0.9 days per year (1993: 389 days v. 1999: 395 days) and a decrease in reappearance rate between first and second lactation of 1% per year (1993:80.4% v. 1999:73.2%).

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