The distribution of serum transferrin types in dairy cattle and their relationship to milk and butterfat production

1967 ◽  
Vol 7 (28) ◽  
pp. 396 ◽  
Author(s):  
MB White ◽  
JC Banfield
Keyword(s):  
Dairy Cattle ◽  
Dairy Cows ◽  
Frequency Distribution ◽  
Gene Frequency ◽  
Type A ◽  
Serum Transferrin ◽  
Lactation Length ◽  
Significant Difference ◽  
Gene Frequency Distribution

The serum transferrin type was identified for 1102 dairy cows. The gene frequency distribution among nine herds of predominantly Friesian type cattle was TfA 40.7 per cent, TfD 55.9 per cent, and TfE 5.4 per cent. In one herd of 31 Red Poll cattle the distribution was TfA 32.3 per cent, TfD 33.8 per cent, and TfE 33.8 per cent. There was no significant difference between the observed and expected distribution of the various genotypes. Cows of genotype D/D produced significantly more milk than those of type A/A, but their butterfat test was lower and the average butterfat production of the two groups was identical. There was no significant difference in lactation length.

Transferrins and milk production in dairy cattle

1969 ◽  
Vol 11 (4) ◽  
pp. 533-542 ◽  
Author(s):  
G. C. Ashton ◽  
R. W. Hewetson
Keyword(s):  
Dairy Cattle ◽  
Dairy Cows ◽  
Milk Production ◽  
Milk Yield ◽  
Production Data ◽  
Serum Transferrin ◽  
Fat Percentage ◽  
Lactation Length ◽  
Best Estimate ◽  
Significant Difference

SUMMARYMilk and butterfat production data from eight herds of dairy cows in Australia for the years 1963 and 1964 were analyzed for relationship with serum transferrin type. In the 932 lactations considered D2/D2 cows produced 521 ± 152 lb of milk more than A/A cows and lactated 15·3 ± 7·8 days longer after correction for season. There was no difference in fat percentage of the milk. The production of A/D2 cows was also significantly higher than A/A cows, but less than D2/D2 cows. Allowing for differences in lactation length still left a significant difference between D2/D2 and A/A cows in milk yield.The best estimate of the effect of replacing a TfA by a TfD2 gene, allowing for season, was 170 lb more milk (P<0·01) and 6·5 days longer lactation (P<0·05), while TfD1 did not differ from TfA in either yield or lactation length.

Gene Frequency Distribution of the BoLA-DRB3 Locus in Saavedreño Creole Dairy Cattle

2004 ◽  
Vol 42 (7/8) ◽  
pp. 231-240 ◽  
Author(s):  
M. V. Ripoli ◽  
J. P. Lirón ◽  
J. C. De Luca ◽  
F. Rojas ◽  
F. N. Dulout ◽  
...  
Keyword(s):  
Dairy Cattle ◽  
Frequency Distribution ◽  
Gene Frequency ◽  
Gene Frequency Distribution

scholarly journals Occurrence of antibodies to Neospora caninum and Toxoplasma gondii in dairy cattle from the northern region of the Paraná State, Brazil

2005 ◽  
Vol 57 (3) ◽  
pp. 312-316 ◽  
Author(s):  
L. Ogawa ◽  
R.L. Freire ◽  
O. Vidotto ◽  
L.F.P. Gondim ◽  
I.T. Navarro
Keyword(s):  
Toxoplasma Gondii ◽  
Dairy Cattle ◽  
Dairy Cows ◽  
Neospora Caninum ◽  
Simultaneous Detection ◽  
Geographic Region ◽  
Northern Region ◽  
Serum Samples ◽  
Significant Difference ◽  
Cattle Management

Three-hundred and eighty-five serum samples were taken from dairy cows on 90 farms in 12 counties from the northern region of the Paraná State, Brazil. The samples were analyzed by IFAT for the detection of anti-Neospora caninum and anti-Toxoplasma gondii IgG antibodies. Forty-five (12%) samples were seropositive to N. caninum, while 102 (26%) samples were seropositive to T. gondii. Only four animals were seropositive to both coccidia. No significant difference was observed between the N. caninum serology and any of the variables studied, such as dairy cattle management, milk production, reproductive problems, feeding, and presence of dogs, cats and rodents. These data suggest that neosporosis is present among dairy cattle in the studied geographic region and the simultaneous detection of serum positive animals to both types of coccidian parasite demonstrates the independent occurrence of these coccidia in dairy cows.

scholarly journals Free-Stall Use and Preferences in Dairy Cows: A Case Study on Neck Rails Covered by Foam

Animals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 772
Author(s):  
Marek Gaworski
Keyword(s):  
Dairy Cattle ◽  
Dairy Cows ◽  
Design Process ◽  
Analysis Of Variance ◽  
Housing System ◽  
Treatment Groups ◽  
Significant Difference

This study tested the effect of neck rails equipped with and without foam on stall usage and preference by dairy cows. The hypothesis of the experiment, that cows prefer lying stalls with foam in comparison to stalls without foam, was rejected. There was no significant difference (p > 0.05) in lying time and time spent standing with two and four hooves in the lying stalls between the two treatment groups. Considering the time of individual stall occupation and the distribution of stalls in the pen, cows showed a preference for one of two lying stall rows. Analysis of variance showed a significant difference (p < 0.001) between the time of stall occupation for the two different rows in the pen, including the time spent lying and the time spent standing with two and four hooves in the stall. Lying time per stall in the preferred row (near the feeding alley) in comparison with the alternative row was 580 ± 101 min·d−1·stall−1 versus 50 ± 28 min·d−1·stall−1, respectively. These results can support a design process for new barns with a free-stall housing system for dairy cattle.

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