Sub-indexes for bulls ofHolsteinbreed in the Czech Republic

Šafus, P.; Štípková, M.; Stádník, Luděk; Přibyl, J.; Čermák, Václav

doi:10.17221/4166-cjas

Cited by 9 publications

(1 citation statement)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar findings were presented by BOUšKA et al (1999). BOUšKA et al (2006) demonstrated that the objective of breeding systems is to maximize the overall herd profit, and therefore they evaluated positively the inclusion of udder traits in the total selection indexes used in the Czech Republic as reported by šAFUS et al (2005). The selection is made according to hereditary disposition, which is defined by the breeding value of selected traits (BEZDíčEK et al 2008).…”

Section: Resultsmentioning

confidence: 99%

Changes in teat parameters caused by milking and their recovery to their initial size

et al. 2010

Self Cite

View full text Add to dashboard Cite

Dairy cows of 2 breeds, 74 Holstein (H) and 72 Czech Fleckvieh (C) cows in the 1st (H, n=38; C, n=38) and 2nd lactation (H, n=36; C, n=34) during the 1st period (n=74; H, n=40; C, n=34; to 150 days) and the 2nd period of lactation (n=72; H, n=34; C, n=38; above 150 days) were observed. Differences in external and internal proportions of teat closely before (the 1st measurement), immediately after (the 2nd measurement) and 3 h after milking (the 3rd measurement), udder conformation evaluated by linear description, somatic cell count, daily milk yield and the time of milking were evaluated in relation to the effect of breed and period of lactation. The length of the teat canal, area of the teat end, and wall thickness were measured from the axial picture recorded by ultrasound Aloka SSD500 (Aloka Co., Ltd., Tokyo, Japan).Significant interbreed differences were detected in external as well as internal teat proportions (P<0.05-0.001). Relative changes of teat diameter, comparing C and H cows, differed significantly between the 1st and the 3rd measurement (P<0.05). The length of teat increased during milking and didn´t achieve the beginning size during 3 h after milking. Significant diiference in the length of teat between the 2nd measurement and the 3rd measurement was determined in H cows only (P<0.001). The most significant changes of the length of the teat canal and the area of teat were found in both breeds between values measured closely before and immediately after milking (P<0.5-0.001). Wall thickness was strengthen in C cows (+15.6 %) during the 2nd measurement according to the 1st (P<0.05), while difference represented +18 % (P<0.001) in H cows. Non-significantly higher values of external proportions of teat were measured in the 2nd period of lactation except diameter of teat closely before milking. Internal proportions of teat were always significantly higher in the 2nd period of lactation in relation to the 1st period. Prolongation of teat canal by 0.15 cm (P<0.01) closely before, by 0.16 cm (P<0.001) immediately after, and by 0.13 cm (P<0.01) 3 h after milking was measured in the 2nd period of lactation. The area of teat end measured before milking was significantly larger in the 2nd period of lactation (P<0.01). Keywords

show abstract

Section: Resultsmentioning

confidence: 99%

Changes in teat parameters caused by milking and their recovery to their initial size

et al. 2010

Self Cite

View full text Add to dashboard Cite

show abstract

Fertility subindex for improving fertility performance in Iranian Holstein cows

Ghiasi

Pakdel

Nejati‐Javaremi

et al. 2014

Trop Anim Health Prod

View full text Add to dashboard Cite

Different fertility indices were constructed for improving fertility performance in Iranian Holstein dairy cows. Number of inseminations per conception and days from calving to first insemination, each weighted by its economic value, were included as breeding goals in the aggregate genotype definition. Different fertility indices (FI) were constructed with different combinations of available fertility traits: number of inseminations to conception (INS), days from calving to first service (DFS), interval between first and last insemination (IFL), and days open (DO). The fertility index (FI1) that included INS and DFS had the greatest genetic gain for INS (-0.39 insemination), DFS (-7.47 days), and profit ($4.3) per generation. Genetic gain for profit, DFS, and INS including only DO showed slight differences regarding FI1. A selection index that included only INS (DFS) presented the larger (smaller) genetic gains for INS and smaller (larger) for DFS, which were -0.40 (-0.034) and -0.975 (-11.18) inseminations and days, respectively. The result of this study showed that recording INS and DFS are preferable traits for including in a fertility subindex. DO can be used in the absence of other fertility traits.

show abstract

Heritabilities and genetic correlations of lactational and daily somatic cell score with conformation traits in Polish Holstein cattle

Ptak¹,

Jagusiak²,

Zarnecki³

et al. 2011

Czech J. Anim. Sci.

View full text Add to dashboard Cite

The objective of this study was to estimate heritabilities and genetic correlations of lactational and daily somatic cell scores with descriptive and linear type traits in Polish Holstein-Friesian cows. Data were: test-day somatic cell scores and conformation evaluations of 24 599 primiparous cows, daughters of 802 sires. Cows calved from 2006 to 2007. The lactational somatic cell score was calculated as the average of four test-day somatic cell scores at least. The daily somatic cell score was the test-day somatic cell score closest to the date of type evaluation. A multi-trait animal model was used to estimate genetic parameters. (Co)variance components were estimated by a Bayesian algorithm via Gibbs sampling. The heritability of lactational somatic cell score was 0.20 and it was much higher than that of daily somatic cell score (0.13). Heritabilities of type traits were high to moderate for height at rump (0.46), size (0.39), overall conformation score (0.30), two linear rump traits (0.28–0.29) and three linear teat traits (0.26–0.29). The genetic correlation between lactational and daily somatic cell scores was 0.84. In many cases, daily somatic cell score showed higher genetic correlations with type traits than lactational somatic cell score. Descriptive udder and feet and legs scores were genetically correlated negatively with both lactational (–0.22 and –0.20) and daily somatic cell scores (–0.28 and –0.33). Somatic cell traits were genetically correlated positively with rump angle (0.21 and 0.19) and negatively with fore udder height (–0.26 and –0.29), udder depth (–0.23 and –0.17) and central ligament (–0.14 and –0.16). Due to higher heritability, direct selection for lower lactational somatic cell score would be more effective than selection for lower daily somatic cell score. The magnitude of obtained heritabilities and the favourable genetic correlations indicate that the selection utilizing some type traits could improve the resistance to mastitis.

show abstract

Sub-indexes for bulls ofHolsteinbreed in the Czech Republic

Cited by 9 publications

References 10 publications

Changes in teat parameters caused by milking and their recovery to their initial size

Changes in teat parameters caused by milking and their recovery to their initial size

Fertility subindex for improving fertility performance in Iranian Holstein cows

Heritabilities and genetic correlations of lactational and daily somatic cell score with conformation traits in Polish Holstein cattle

Contact Info

Product

Resources

About