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Are winter rangelands enough to satisfy the nutritional requirements of late‑gestation transhumant goats in Patagonia?
Caballero, Veronica Jorgelina; Romero Martinez, Jesus; Borrelli, Laura Beatriz; Castillo, Daniel Alejandro; Mikuc, Juan Pablo; Villar, Maria Laura; Villagra, Edgar Sebastian (Springer, 2022-08-03)Transhumant herds graze across two different rangeland types according to the season. Winter rangelands differ from summer rangelands in the amount and quality of available fodder, with the former being the less productive. ... -
Dietary nitrate and presence of protozoa increase nitrate and nitrite reduction in the rumen of sheep
Villar, Maria Laura; Hegarty, Roger Stephen; Clay, Jonathon William; Smith, Katherine Anne; Godwin, Ian Robert; Nolan, John Vivian (Wiley, 2020-04)Nitrate (NO−3) supplementation is an effective methane (CH4) mitigation strategy for ruminants but may produce nitrite (NO−2) toxicity. It has been reported that rumen protozoa have greater ability for NO−3 and NO−2 reduction ... -
Dietary nitrate metabolism and enteric methane mitigation in sheep consuming a protein-deficient diet
Villar, Maria Laura; Hegarty, Roger S.; Van Tol, M.; Godwin, Ian R.; Nolan, John V. (CSIRO Publishing, 2019-09-20)It was hypothesised that the inclusion of nitrate(NO3 –) or cysteamine hydrochloride (CSH) in a protein deficient diet (4.8% crude protein; CP) would improve the productivity of sheep while reducing enteric methane (CH4) ... -
The effect of dietary nitrate and canola oil alone or in combination on fermentation, digesta kinetics and methane emissions from cattle
Villar, Maria Laura; Hegarty, Roger Stephen; Nolan, John V.; Godwin, Ian R.; McPhee, Malcolm J. (Elsevier, 2020-01)Nitrate and lipids have been recognized as effective dietary additives to reduce enteric methane (CH4) production. The objective of this experiment was to evaluate the effects of nitrate (NO3¯) and canola oil, alone or in ... -
Manejo nutricional pre y post-destete en crias de cabras angora del norte de la patagonia
Villar, Maria Laura; Bruno Galarraga, María Macarena; Giovannini, Nicolas; Fernandez, Jimena; Cueto, Marcela Isabel; Villagra, Edgar Sebastian (Facultad de Ciencias Veterinarias, Universidad Nacional de La Pampa, 2021-12)En los hatos de cabras Angora en el norte de la región Patagónica, las crías suelen manifestar deficiencias nutricionales desde el nacimiento hasta el destete a los 90 días que se asocian a bajas tasas de señalada y destete, ... -
Nitrate and nitrite absorption, recycling and retention in tissues of sheep
Villar, Maria Laura; Godwin, Ian Robert; Hegarty, Roger Stephen; Erler, Dirk V.; Farid, Haneih T.; Nolan, John Vivian (Elsevier, 2021-07)Dietary nitrate is of increasing interest both for the pharmacological effects of its metabolites as well as its capacity to inhibit methanogenesis in the gut. A sequence of three experiments was conducted to investigate ... -
Producción de leche y crecimiento de corderos de ovejas merino en pastoreo extensivo en Patagonia Norte = Milk yield and lamb growth of Merino ewes under extensive grazing in Northern Patagonia
Villar, Maria Laura; Cueto, Marcela Isabel; Giraudo, Celso Gabriel (Asociación Argentina de Producción Animal, 2021-11)El objetivo del presente trabajo fue determinar la producción de leche entre las semanas 2- 16 después del parto en ovejas Merino en pastoreo extensivo y establecer su relación con el crecimiento de los corderos hasta el ... -
Short-term energy supplementation before lambing improves maternal behaviour, udder volume, colostrum viscosity and lamb birthweight in ewes under extensive grazing
Villar, Maria Laura; Giraudo, Celso Gabriel; Cueto, Marcela Isabel (Elsevier, 2023-02)The aim of the present experiment was to evaluate the effect of short-term energy supplementation before lambing on maternal and lamb behaviour and colostrum production in a large-scale trial in Merino sheep under extensive ... -
The effects of dietary nitrate on plasma glucose and insulin sensitivity in sheep
Villar, Maria Laura; Godwin, Ian R.; Hegarty, Roger S.; Dobos, Robin Christopher; Smith, Katherine A.; Clay, Jonathon W.; Nolan, John V. (Wiley Online Library, 2019-07)Nitrate (NO3 ¯) is an effective non‐protein nitrogen source for gut microbes and reduces enteric methane (CH4) production in ruminants. Nitrate is reduced to ammonia by rumen bacteria with nitrite (NO2 ¯) produced as an ...