scholarly journals The effect of the Robertsonian translocation 1/29 on the fertility of beef cattle reared under extensive conditions: a 30 years retrospective study

Author(s):  
J.M. Jiménez ◽  
R. Morales ◽  
A. Molina ◽  
M. Moreno‐Millán ◽  
S. Demyda Peyrás



1989 ◽  
Vol 69 (4) ◽  
pp. 891-896 ◽  
Author(s):  
SHEILA M. SCHMUTZ ◽  
JANE MOKER

This paper examines the spread and influence of a 1;29 Robertsonian translocation in a purebred beef herd. An entire herd of 94 Charolais cattle has been karyotyped since discovery of a 1;29 Robertsonian translocation in two yearling bulls entered in the Saskatoon R.O.P. bull test station in 1987. The translocation was inherited through their maternal grandfather. Approximately 46% (43) of the 94 cattle karyotyped possessed this translocation, including one cow which had two copies (58, XX, tt). The test herd consisted of 59 cows, 4 bulls, and 31 calves with 27, 2, and 14 animals affected respectively. In addition one cow with an additional X chromosome was detected (61, XXX). The overall fertility of this herd had been low but alterations in management practices lessened the negative impact. Prolonged bull exposure, first exposure of females at 2 y of age, and continued surveillance of cows returning to heat followed by rebreeding ensured that most cows did produce calves in most years. However, although such practices reduced the culling rate, they maintained the translocation carrier cows in the herd. Key words: Beef cattle, translocation, embryonic loss, subfertility



Genome ◽  
1987 ◽  
Vol 29 (3) ◽  
pp. 504-509 ◽  
Author(s):  
J. McWhir ◽  
R. B. Church ◽  
G. H. Coulter ◽  
C. C. Lin

Metaphase chromosomes were prepared from peripheral leukocyte cultures of 253 beef animals representing 21 breeds. A total of 10 Robertsonian translocations were identified. Nine were 1/29 fusions and one was a stable 14/20 fusion identified in several Simmentals. To our knowledge, the only other case of this translocation reported was also in the Simmental breed, suggesting that this fusion may be unique to the breed. A further 54 relatives of known 1/29 and 14/20 carriers were examined, revealing that both fusions were inherited by 50% of offspring of the heterozygous carrier. Heterozygous male 1/29 carriers left fewer calves than karyotypically normal bulls when used in natural service. Key words: Robertsonian translocation, cattle, chromosomes, fertility.



2022 ◽  
Vol 52 (4) ◽  
Author(s):  
Germán José Cantón ◽  
Eduardo Luján Fernández ◽  
Juan Ignacio Poo ◽  
Ernesto Juan Alfredo Späth ◽  
Ernesto Raúl Odriozola ◽  
...  

ABSTRACT: Hypomagnesaemia (grass tetany) is a metabolic disorder of ruminants due to a reduced dietary intake of magnesium (primary deficiency), incorrect digestibility or associated metabolic factors reducing Mg intake (secondary deficiency). Grass tetany is a production disease responsible for important economic losses in beef herds from Argentina. Several factors influence the development of grass tetany in cattle, including physiological status, weather, soil and forage. This research described a retrospective analysis over the past 20 years, revising the cases of beef cattle clinical hypomagnesaemia registered at the Veterinary Diagnostic Service in INTA Balcarce, Argentina.





2020 ◽  
Vol 47 (6) ◽  
pp. 855.e3
Author(s):  
C. Cannarozzo ◽  
P. Kirch ◽  
L. Campoy ◽  
R. Gleed ◽  
M. Martin-Flores
Keyword(s):  


Ob Gyn News ◽  
2005 ◽  
Vol 40 (8) ◽  
pp. 6
Author(s):  
Christine Kilgore
Keyword(s):  


2018 ◽  
Vol 24 ◽  
pp. 249
Author(s):  
David Broome ◽  
Gauri Bhuchar ◽  
Ehsan Fayazzadeh ◽  
James Bena ◽  
Christian Nasr


2006 ◽  
Vol 12 ◽  
pp. 65
Author(s):  
Ghasak Mahmood ◽  
Sylvia J. Shaw ◽  
Yaga Szlachick ◽  
Rod Atkins ◽  
Stefan Bughi


Sign in / Sign up

Export Citation Format

Share Document