EurekaMag.com logo
+ Site Statistics
References:
47,893,527
Abstracts:
28,296,643
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn

+ Translate

Relationship between production and days open at different levels of herd production


, : Relationship between production and days open at different levels of herd production. Journal of Dairy Science 77(6): 1682-1690

Five production variables and days open were analyzed using 611,680 records from 348,243 cows in 5694 herds enrolled in the Wisconsin DHI program. Production variables included 305-d milk production and several production measures adjusted for combinations of mature equivalent, fat and protein content, and effects of days open. Herds were divided into four groups by herd production. Heritability estimates for production variables ranged from .27 for mature equivalent milk that was corrected for fat and protein content and adjusted for days open to .34 for mature equivalent milk and for mature equivalent milk that was adjusted for days open. Adjustment of production records for days open had little impact on heritability estimates of production traits. Heritability for days open was approximately .05. Heritability estimates were larger for all, measures of production and for days open for the herds with higher mean production. The effects of parity and season were important for both adjusted and unadjusted measures of production. After production variables were adjusted for mature equivalent factors, large differences remained between REML estimates of fixed effects of parity and season. For days open, estimates were larger for later parity cows and were highest for cows calving during spring. For measures of production, estimates were largest between first and second parity cows and between winter and summer calvings. Within herd, days open were longer for cows with higher production. Regressions of days open on production records that were not adjusted for days open were significantly larger for the herds at lower production.

Accession: 002477939

PMID: 8083428

DOI: 10.3168/jds.S0022-0302(94)77110-1

Download PDF Full Text: Relationship between production and days open at different levels of herd production


Submit PDF Full Text

No spam - Every submission is manually reviewed

Due to poor quality, we do not accept files from Researchgate

Submitted PDF Full Texts will always be free for everyone
(We only charge for PDFs that we need to acquire)

Select a PDF file:
Close
Close

Related references

Jagusiak, W.; Zarnecki, A., 2005: Relationship between days open and different herd average phenotypic and genetic levels of production in Polish Holsteins. The phenotypic and genetic relationships of days open (DO), service period (SP) and the interval from first calving to first insemination (CFI) with herd production level and average herd breeding value were estimated using fertility and productio...

Djemali, M.; Freeman, A.E.; Berger, P.J., 1987: Reporting of dystocia scores and effects of dystocia on production, days open, and days dry from dairy herd improvement data. Dystocia and livability scores are collected through the Mid-States Dairy Records Processing Center. Thirty-four percent of the cows had dystocia scores reported. Least difficult births were scored 1 and the most difficult births scored 5. Days op...

Djemali, M.S.; Freeman, A.E.; Berger, P.J., 1985: Completeness of reporting of dystocia scores and the effects of dystocia on production, days open and days dry from Dairy Herd Improvement data. Of 555 562 cows, 34% had dystocia scores, and of these 8% of cows in 1st lactation and 2% of cows in later lactations had scores 4 or 5. The yield difference between cows with dystocia scores of 1 and 5 in 1st, 2nd and 3rd lactation resp. was 548,...

Atil, H., 2000: Genetic relationship between days open and days dry with milk yield in a herd of Holstein Friesian cattle. A total of 2897 lactation records of Holstein Friesian cattle from the fields of Dena Farm in Egypt during 1987-93 were used to study relationships of days open and days dry with milk production. The effect of month and year of calving, sire and c...

Jagannatha, Shylaja, 1993: Effects of days open, days dry and season of freshening on income over feed cost and 305-day mature equivalent milk yield, for three different production levels

Teixeira, N.M.; Ferreira, W.J.; Freitas, A.F. de; Duraes, M.C.; Magalhaes Junior, M.N., 2000: Effect of days open during early lactation on the relations between milk production and days open in Holstein cows. The objective of this work was to verify if it is necessary to adjust the 305-day milk yield for yield in the early lactation in determining the effect of days open on milk production. The yields in early lactation were represented by the cumulati...

Goodwill, R.E.; Berger, P.J.; Freeman, A.E., 1984: Effects of previous days open, previous days dry and present days open on milk production in Holsteins. Data from 86 801 Holstein-Friesian cows showed that 120- and 305-day milk yield increased as open period (calving to conception) in the present lactation increased. 305-day yield increased as previous open period or dry period increased, but 120-d...

Lee, D.H.; Han, K.J., 2004: Genetic relationship between milk production, calving ease and days open at first parity in Holstein cows. Data containing 14 188 lactation and reproductive records of Korean Holstein cows at first parity distributed across 3734 herd-year-season groups were analysed to get the genetic (co)variance estimates for milk yield, fat yield, calving ease, and...

Khattab A.S.; Ashmawy A.A., 1988: Relationships of days open and days dry with milk production in friesian cattle in egypt. A total of 1620 lactation records of Friesian cattle from the files of the Ministry of Agriculture farms at Sakha and El-Karada from 1969 through 1979 were used to study relationships of days open and days dry with milk production. The effect of f...

Patel A.M., 1989: Days open and days dry to maximize milk production in jersey x kankrej f 1 cows. Indian Journal of Animal Sciences 59(1): 169-170