RESUMEN
This study aimed to compare grazing behavior of dairy cows with highly contrasting pasture allocation frequencies. The study ran from September 9, 2022, to December 2, 2022 (12 wk), during a time when daily pasture growth was expected to exceed daily herd intake. Three pasture allocation frequencies were compared, each with 11 spring-calving cows grazing a 4-ha farmlet. The allocations were high frequency rotational grazing (HFRG; 32.5 m2/cow per allocation and 4 allocations/d), rotational grazing with weekly allocations (7RG; 909 m2/cow per allocation and each allocated area continuously grazed over 7 d), and continuous grazing (CG; 1,818 m2/cow per allocation). Animal behavior was monitored using IceQube accelerometers (Peacock Technology) and CowManager ear tags (Agis Automatisering BV). Milk yield and composition were measured and pasture cover was estimated. Daily eating time was highest for CG animals, whereas lying time, lying bouts, and ruminating time were lowest, with no differences between HFRG and 7RG. There were no differences in fat- and protein-corrected milk yield between farmlets; however, estimated accumulated pasture yield was greater with more frequent allocations. Although milk production did not differ between treatment groups, this appeared to be achieved through greater eating times when allocated pasture less frequently, at the expense of time spent lying.
RESUMEN
INTRODUCTION: Migraine is a highly prevalent neurological disease and the search for an effective treatment to improve the patient's quality of life is essential. In 2018, anti-CGRP monoclonal antibodies were approved in Spain as a preventive treatment, and have proved to be effective in reducing the number of migraine crisis per month compared to placebo. PATIENTS AND METHODS: We conducted a descriptive and retrospective study of 14 patients suffering from high-frequency or chronic episodic migraine, under follow-up in our headache unit, in whom an anti-CGRP monoclonal was changed due to its ineffectiveness. Epidemiological data and variables related to the response to both drugs were collected, such as headache days per month and migraine days per month, as well as validated quality of life scales (Migraine Disability Assessment Scale and Headache Impact Test-6). RESULTS: 50% of patients were males, with a median age of 46.5 years and 92% were diagnosed with chronic migraine. A follow-up of 6 to 12 months after the change of treatment was performed in 91.6% and significant improvement was observed in 33% of the patients. In addition, 50% had an initial response after three doses of the first monoclonal drug. CONCLUSIONS: In our series, 66% of patients who did not respond to a first drug responded initially to the switch and this improvement was maintained in 36% of them. Larger studies are needed to clarify this difference in response to different anti-CGRP monoclonal antibodies.
TITLE: Fracaso de un anticuerpo monoclonal anti-CGRP en el tratamiento de la migraña. ¿Tiene sentido probar otro?Introducción. La migraña es una enfermedad neurológica altamente prevalente y la búsqueda de un tratamiento eficaz que mejore la calidad de vida del paciente es fundamental. En 2018 se aprobaron en España los anticuerpos monoclonales anti-CGRP como tratamiento preventivo, y han demostrado eficacia al reducir el número de crisis de migraña al mes frente a placebo. Pacientes y métodos. Estudio descriptivo y retrospectivo de 14 pacientes con migraña episódica de alta frecuencia y crónica, en seguimiento en nuestra unidad de cefaleas, en los que se ha realizado el cambio de un monoclonal anti-CGRP por ineficacia. Se han recogido datos epidemiológicos y variables relacionadas con la respuesta a ambos fármacos, como los días de cefalea al mes y los días de migraña al mes, además de escalas validadas de calidad de vida (Migraine Disability Assessment Scale y Headache Impact Test-6). Resultados. El 50% de los pacientes son varones, con una mediana de edad de 46,5, y el 92% estaba diagnosticado de migraña crónica. Se realizó un seguimiento de entre seis y 12 meses tras el cambio de tratamiento en el 91,6%, y se observó mejoría significativa en el 33% de los pacientes. Además, en el 50% se objetivó respuesta inicial tras tres dosis con el primer monoclonal. Conclusiones. En nuestra serie, el 66% de los pacientes que no respondieron a un primer fármaco respondió inicialmente al cambio, y esta mejoría se mantuvo en el 36%. Se precisan estudios más amplios para aclarar esta diferencia de respuesta a los distintos anticuerpos monoclonales anti-CGRP.