Cattle Raising in Central, Semiarid Rangelands of Argentina

Giorgetti, Hugo Dosindo; Busso, Carlos; Montenegro, Oscar Alberto

doi:10.2458/azu_rangelands_v28i1_giorgetti

Cited by 7 publications

(11 citation statements)

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“…Early weaning is an increasing practice management in the Caldenal and the Monte (Giorgetti et al, 2006;Kugler et al, 2008) since it tends to improve reproductive *Corresponding author. E-mail: cebusso@criba.edu.ar.…”

Section: Introductionmentioning

confidence: 99%

Growth, blood metabolites and hormones in calves fed diets with different amounts of energy and protein during the pre- or post-weaning periods

Fernández¹

2012

Afr. J. Agric. Res.

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We investigated the effects of diets differing in energy and protein concentrations given during pre-and post-weaning on hormone and metabolite levels in association to parameters of growth. Sixteen Aberdeen Angus calves four-day-old were allocated in individual pens during 105 days in a randomized complete design. Animals consumed ad libitum various diets differing in proportion of energy and protein (A: 80% of concentrate, 20% alfalfa hay; B: 60% concentrate, 40% of alfalfa hay; C: 40% concentrate, 60% alfalfa hay, and D: 20% concentrate, 80% alfalfa hay). Also, calves consumed milk substitute up to 60-day-old day. Serum growth hormone and cortisol levels were not altered with diet changes (P > 0.05) neither during the pre-nor the post-weaning periods. Plasma insulin concentration average daily intake, glucose and thyroid hormone levels, and concentrations of ammonia nitrogen and propionic acid were greater (P < 0.01) for diets having higher than lower energy and protein levels during the post-weaning but not during the pre-weaning period. These results suggest inclusion of higher amounts of concentrate in the diet of weaned calves.

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Section: Introductionmentioning

confidence: 99%

Growth, blood metabolites and hormones in calves fed diets with different amounts of energy and protein during the pre- or post-weaning periods

Fernández¹

2012

Afr. J. Agric. Res.

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“…a smaller plant growth) than in 2007/2008 (125·5 mm). This defoliation management mimics the short duration – high intensity, rotational‐stocking system applied at the ‘Monte’ vegetation in the Chacra Experimental of Patagones (see Giorgetti et al ., for details; mean = 29·2 animal unit ha −1 ). Within this system, some acceptable forage can be grazed twice by grazing livestock during their at least 30‐day stay in the paddocks (Giorgetti, ).…”

Section: Methodsmentioning

confidence: 99%

“…Within this system, some acceptable forage can be grazed twice by grazing livestock during their at least 30‐day stay in the paddocks (Giorgetti, ). In Argentina, an animal unit is defined as the annual average dry forage requirement of a 400‐kg cow that goes through gestation and subsequent nursing of a calf, until the 160‐kg, 6‐month‐old calf is weaned, including the forage consumed by the calf (Giorgetti et al ., ). Defoliations were applied to the same plants in each year.…”

Section: Methodsmentioning

confidence: 99%

Plant growth and survival of five introduced and two native/naturalized perennial grass genotypes exposed to two defoliation managements in arid Argentina

Torres

Busso

Montenegro³

et al. 2013

Grass and Forage Science

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The field performance of the native Pappophorum vaginatum, the naturalized Eragrostis curvula and various cultivars of the introduced Achnatherum hymenoides and Leymus cinereus was evaluated as potential forage resources in rangelands of arid Argentina during the warm seasons of 2007/2008 and 2008/2009. Plants of these grass species, obtained from seeds, were transplanted to the field in 2006, when they were 1 year old. During the study years, there were two defoliation managements: plants of all study genotypes either remained undefoliated (controls) or were defoliated twice a year during spring at 5 cm stubble height. Despite tiller number being lower (P < 0·05) on defoliated than on undefoliated plants, and total leaf length per unit basal area being similar (P > 0·05) between defoliation managements by mid‐spring, there were no differences (P > 0·05) in dry weight production between defoliated and undefoliated plants in all genotypes at the end of the second growing season. Plants of one or more of the introduced genotypes showed a similar (P > 0·05) or greater (P < 0·05), but not lower, tiller number per plant and per square centimetre, daughter tiller production, total leaf length and dry weight production per unit basal area than the native species at the end of the first and/or second growing seasons. These morphological variables were similar (P > 0·05) or greater (P < 0·05) in the native than in the naturalized genotype. Plant survival, however, was lower (P < 0·05, overall mean = 20%) in the introduced than in the native (>70%) or naturalized (>39%) genotypes at the end of the first or second growing seasons.

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“…Defoliation treatments were delayed in the second growing cycle because of a lower rainfall during September to December in 2008-2009 (62 mm; i.e., a smaller plant growth) than in 2007-2008 (125.5 mm). This defoliation management mimics the short duration-high intensity, rotational grazing system applied at the "Monte'' vegetation in the Chacra Experimental of Patagones (Giorgetti et al, 2006;mean=0.13 animal unit/hm 2 ). Within this system, some acceptable forage can be grazed twice by grazing livestock during their at least 30-day-stay in the paddocks (Giorgetti, 1995).…”

Section: Experimental Design and Defoliation Treatmentsmentioning

confidence: 99%

Root proliferation in native perennial grasses of arid Patagonia, Argentina

Torres

Busso

Montenegro³

et al. 2013

J. Arid Land

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Pappophorum vaginatum is the most abundant C 4 perennial grass desirable to livestock in rangelands of northeastern Patagonia, Argentina. We hypothesized that (1) defoliation reduce net primary productivity, and root length density and weight in the native species, and (2) root net primary productivity, and root length density and weight, are greater in P. vaginatum than in the other, less desirable, native species (i.e., Aristida spegazzinii, A. subulata and Sporobolus cryptandrus). Plants of all species were either exposed or not to a severe defoliation twice a year during two growing seasons. Root proliferation was measured using the cylinder method. Cylindrical, iron structures, wrapped up using nylon mesh, were buried diagonally from the periphery to the center on individual plants. These structures, initially filled with soil without any organic residue, were dug up from the soil on 25 April 2008, after two successive defoliations in mid-spring 2007. During the second growing season (2008-2009), cylinders were destructively harvested on 4 April 2009, after one or two defoliations in midand/or late-spring, respectively. Roots grown into the cylinders were obtained after washing the soil manually. Defoliation during two successive years did reduce the study variables only after plants of all species were defoliated twice, which supported the first hypothesis. The greater root net primary productivity, root length density and weight in P. vaginatum than in the other native species, in support of the second hypothesis, could help to explain its greater abundance in rangelands of Argentina.

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Cattle Raising in Central, Semiarid Rangelands of Argentina

Cited by 7 publications

References 1 publication

Growth, blood metabolites and hormones in calves fed diets with different amounts of energy and protein during the pre- or post-weaning periods

Growth, blood metabolites and hormones in calves fed diets with different amounts of energy and protein during the pre- or post-weaning periods

Plant growth and survival of five introduced and two native/naturalized perennial grass genotypes exposed to two defoliation managements in arid Argentina

Root proliferation in native perennial grasses of arid Patagonia, Argentina

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