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L. L. Benyshek - One of the best experts on this subject based on the ideXlab platform.
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genetic parameter estimates for carcass and yearling ultrasound measurements in Brangus Cattle
Journal of Animal Science, 1998Co-Authors: D W Moser, L A Kriese, J K Bertrand, Ignacy Misztal, L. L. BenyshekAbstract:: Carcass measurements of 12th-rib fat thickness (CARCFAT), longissimus muscle area (CARCLMA), and weight (CARCWT) on 2,028 Brangus and Brangus-sired fed steers and heifers, as well as yearling weights (YWT) and ultrasound measures of 12th-rib fat thickness (USFAT) and longissimus muscle area (USLMA) on 3,583 Brangus bulls and heifers were analyzed to estimate genetic parameters. Data were analyzed using a six-trait animal model and an average information REML algorithm. The model included fixed effects for contemporary group and breed of dam, covariates for age at slaughter or measurement, and random animal and residual effects. Heritabilities for CARCFAT, CARCLMA, CARCWT, USFAT, USLMA, and YWT were .27+/-.05, .39+/-.05, .59+/-.06, .11+/-.03, .29+/-.04, and .40+/-.04, respectively. Genetic correlations between CARCFAT and USFAT, CARCLMA and USLMA, and CARCWT and YWT were .69+/-.18, .66+/-.14, and .61+/-.11, respectively. The favorable and moderately strong genetic correlations between carcass measurements and similar yearling breeding-animal ultrasound measurements indicate that such measurements of 12th-rib fat and longissimus muscle area are useful in predicting genetic values for carcass leanness and longissimus muscle area. Selection using yearling ultrasound measurements of breeding Cattle should result in predictable genetic improvement for carcass characteristics. Inclusion of yearling ultrasound measurements for fat thickness and longissimus muscle area should enhance national Cattle evaluation programs.
D W Moser - One of the best experts on this subject based on the ideXlab platform.
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genetic parameter estimates for carcass and yearling ultrasound measurements in Brangus Cattle
Journal of Animal Science, 1998Co-Authors: D W Moser, L A Kriese, J K Bertrand, Ignacy Misztal, L. L. BenyshekAbstract:: Carcass measurements of 12th-rib fat thickness (CARCFAT), longissimus muscle area (CARCLMA), and weight (CARCWT) on 2,028 Brangus and Brangus-sired fed steers and heifers, as well as yearling weights (YWT) and ultrasound measures of 12th-rib fat thickness (USFAT) and longissimus muscle area (USLMA) on 3,583 Brangus bulls and heifers were analyzed to estimate genetic parameters. Data were analyzed using a six-trait animal model and an average information REML algorithm. The model included fixed effects for contemporary group and breed of dam, covariates for age at slaughter or measurement, and random animal and residual effects. Heritabilities for CARCFAT, CARCLMA, CARCWT, USFAT, USLMA, and YWT were .27+/-.05, .39+/-.05, .59+/-.06, .11+/-.03, .29+/-.04, and .40+/-.04, respectively. Genetic correlations between CARCFAT and USFAT, CARCLMA and USLMA, and CARCWT and YWT were .69+/-.18, .66+/-.14, and .61+/-.11, respectively. The favorable and moderately strong genetic correlations between carcass measurements and similar yearling breeding-animal ultrasound measurements indicate that such measurements of 12th-rib fat and longissimus muscle area are useful in predicting genetic values for carcass leanness and longissimus muscle area. Selection using yearling ultrasound measurements of breeding Cattle should result in predictable genetic improvement for carcass characteristics. Inclusion of yearling ultrasound measurements for fat thickness and longissimus muscle area should enhance national Cattle evaluation programs.
Raluca G. Mateescu - One of the best experts on this subject based on the ideXlab platform.
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Genome-wide association study identifies variants associated with hair length in Brangus Cattle.
Animal genetics, 2020Co-Authors: K. M. Sarlo Davila, A. Howell, Andrea Nunez, A. Orelien, V. Roe, Eduardo Rodriguez, Serdal Dikmen, Raluca G. MateescuAbstract:Thermal stress limits beef Cattle production and a shorter hair coat is a key thermoregulative adaptation that allows Cattle to lose heat more efficiently. The objective of this study was to identify genetic variants associated with the length of the undercoat and topcoat of Cattle utilizing 1456 Brangus heifers genotyped with the Bovine GGP F250 array. Seven SNPs in the PCCA gene were significantly associated with undercoat length. PCCA belongs to the biotin transport and metabolism pathway. Biotin deficiency has been reported to cause hair loss. Four SNPs in an 110 kb including a missense mutation in the PRLR gene were significantly associated with topcoat length. Whereas the association of this polymorphism with hair length is novel, the SLICK mutation in PRLR has previously been demonstrated to significantly impact hair length in Cattle. These newly detected genetic variants may contribute to a shorter hair coat and more thermotolerant animals.
Bonatte-junior P. - One of the best experts on this subject based on the ideXlab platform.
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Correlation between Rhipicephalus microplus ticks and Anaplasma marginale infection in various Cattle breeds in Brazil.
Experimental and Applied Acarology jun. 2020., 2020Co-Authors: Martins K. R., Barros J. C., Garcia M., Duarte P. O., Bonatte-junior P., Leandro Oliveira Souza Higa, Csordas B. G., Andreotti R.Abstract:The tick Rhipicephalus microplus is responsible for the transmission of Anaplasma marginale, which causes hemolytic anemia, abortion, decreased production, and mortality in Cattle in Brazil. However, A. marginale can also persist in Cattle herds without any clinical signs. This study investigated the relationship between the number of ticks present on each Cattle and the circulating number of A. marginale msp1β gene copies in the blood of Brangus and Nellore Cattle reared in the Brazilian Cerrado through a year period. Twenty-three animals (11 Brangus and 12 Nellore) were raised for 12 months with ticks counted every 18 days, and blood collected every 36 days. Blood sera was used for total antigen iELISA, genomic DNA was extracted from whole blood by the phenol/chloroform method and then analyzed by PCR to confirm A. marginale presence with the msp5 gene. Positive samples were quantified by qPCR using msp1β gene. Brangus Cattle presented 4.5 fold more ticks than Nellore group. Although Brangus Cattle carried a higher overall A. marginale msp1β gene presence than Nellore Cattle, no relationship of tick count and copy number could be achieved due to high variability in copy number. Moreover, both breeds showed similar weight gain and a similar serological pattern throughout the year. None of the animals showed any clinical signs of anaplasmosis during the experimental period, indicating that a low level of tick infestation may be sufficient to maintain a stable enzootic situation.bitstream/item/219597/1/16-Correlation-between.pd
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Cattle tick infestation in Brangus Cattle raised with Nellore in central Brazil.
'Universidade Estadual de Londrina', 2018Co-Authors: Andreotti R., Barros J. C., Garcia M., Rodrigues V. Da S., Higa L. De O. S., Duarte P. O., Blecha I. M. Z., Bonatte-junior P.Abstract:The present study evaluated the behavior of Rhipicephalus microplus naturally infesting Brangus Cattle raised with Nellore animals in the municipality of Água Clara, state of Mato Grosso do Sul, Central Brazil. For the field experiment composed of a group with 15 Brangus animals and 15 Nellore animals and a control group with 30 Brangus Cattle, all at the post-weaning stage. The 2 groups were kept for 6 months in 2 adjacent paddocks, naturally infested with ticks, at a stocking rate of approximately 0.6 of an animal unit per hectare (AU/ha). Every 18 days, the animals were weighed, and ticks on both sides of each bovine were counted. Every 36 days, blood was collected for hematocrit measurement and molecular diagnosis of the 3 pathogens that cause tick fever. The Brangus animals had 6.8 times more ticks than the Nellore Cattle. No significant difference was observed in the weight gain of the Brangus and Nellore animals, and no correlation between the number of ticks and weight was observed in either group. During the 6 months of the study, all animals presented normal hematocrit, were positive for Babesia bigemina and Anaplasma marginale, and were negative for Babesia bovis. Animals in Group 1 produced 27% fewer ticks than the animals in Group 2. The production rate of engorged female ticks in Nellore and Brangus Cattle was 0.83% and 2.01%, respectively. Considering the infestation pattern required to produce 10 engorged females/day/animal, the Nellore and Brangus animals required 1,204 and 497 larvae/day, respectively. Our estimates showed that Brangus Cattle need only 11.3% of the larvae in the pastures with Nellore Cattle to maintain the infestation level observed in the present study. Brangus animals raised with Nellore Cattle do not have a lower parasitic load and continue to suffer from tick infestation. Finally, Nellore Cattle raised with Brangus Cattle do not act as a cleaner because this grouping does not contribute to a reduced infestation in the Brangus animals. Key words: Bovine. Cattle tick. Control. Infestation.bitstream/item/188749/1/Cattle-tick-infestation-in-Brangus.pdfTítulo em português: Infestação de carrapatos em bovinos Brangus criados com Nelore no Brasil central
Andreotti R. - One of the best experts on this subject based on the ideXlab platform.
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Correlation between Rhipicephalus microplus ticks and Anaplasma marginale infection in various Cattle breeds in Brazil.
Experimental and Applied Acarology jun. 2020., 2020Co-Authors: Martins K. R., Barros J. C., Garcia M., Duarte P. O., Bonatte-junior P., Leandro Oliveira Souza Higa, Csordas B. G., Andreotti R.Abstract:The tick Rhipicephalus microplus is responsible for the transmission of Anaplasma marginale, which causes hemolytic anemia, abortion, decreased production, and mortality in Cattle in Brazil. However, A. marginale can also persist in Cattle herds without any clinical signs. This study investigated the relationship between the number of ticks present on each Cattle and the circulating number of A. marginale msp1β gene copies in the blood of Brangus and Nellore Cattle reared in the Brazilian Cerrado through a year period. Twenty-three animals (11 Brangus and 12 Nellore) were raised for 12 months with ticks counted every 18 days, and blood collected every 36 days. Blood sera was used for total antigen iELISA, genomic DNA was extracted from whole blood by the phenol/chloroform method and then analyzed by PCR to confirm A. marginale presence with the msp5 gene. Positive samples were quantified by qPCR using msp1β gene. Brangus Cattle presented 4.5 fold more ticks than Nellore group. Although Brangus Cattle carried a higher overall A. marginale msp1β gene presence than Nellore Cattle, no relationship of tick count and copy number could be achieved due to high variability in copy number. Moreover, both breeds showed similar weight gain and a similar serological pattern throughout the year. None of the animals showed any clinical signs of anaplasmosis during the experimental period, indicating that a low level of tick infestation may be sufficient to maintain a stable enzootic situation.bitstream/item/219597/1/16-Correlation-between.pd
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Cattle tick infestation in Brangus Cattle raised with Nellore in central Brazil.
'Universidade Estadual de Londrina', 2018Co-Authors: Andreotti R., Barros J. C., Garcia M., Rodrigues V. Da S., Higa L. De O. S., Duarte P. O., Blecha I. M. Z., Bonatte-junior P.Abstract:The present study evaluated the behavior of Rhipicephalus microplus naturally infesting Brangus Cattle raised with Nellore animals in the municipality of Água Clara, state of Mato Grosso do Sul, Central Brazil. For the field experiment composed of a group with 15 Brangus animals and 15 Nellore animals and a control group with 30 Brangus Cattle, all at the post-weaning stage. The 2 groups were kept for 6 months in 2 adjacent paddocks, naturally infested with ticks, at a stocking rate of approximately 0.6 of an animal unit per hectare (AU/ha). Every 18 days, the animals were weighed, and ticks on both sides of each bovine were counted. Every 36 days, blood was collected for hematocrit measurement and molecular diagnosis of the 3 pathogens that cause tick fever. The Brangus animals had 6.8 times more ticks than the Nellore Cattle. No significant difference was observed in the weight gain of the Brangus and Nellore animals, and no correlation between the number of ticks and weight was observed in either group. During the 6 months of the study, all animals presented normal hematocrit, were positive for Babesia bigemina and Anaplasma marginale, and were negative for Babesia bovis. Animals in Group 1 produced 27% fewer ticks than the animals in Group 2. The production rate of engorged female ticks in Nellore and Brangus Cattle was 0.83% and 2.01%, respectively. Considering the infestation pattern required to produce 10 engorged females/day/animal, the Nellore and Brangus animals required 1,204 and 497 larvae/day, respectively. Our estimates showed that Brangus Cattle need only 11.3% of the larvae in the pastures with Nellore Cattle to maintain the infestation level observed in the present study. Brangus animals raised with Nellore Cattle do not have a lower parasitic load and continue to suffer from tick infestation. Finally, Nellore Cattle raised with Brangus Cattle do not act as a cleaner because this grouping does not contribute to a reduced infestation in the Brangus animals. Key words: Bovine. Cattle tick. Control. Infestation.bitstream/item/188749/1/Cattle-tick-infestation-in-Brangus.pdfTítulo em português: Infestação de carrapatos em bovinos Brangus criados com Nelore no Brasil central