Doce, R. R., Baron, V. S., and Dick, A. C. 2015. Estimating swath-grazed carrying capacity from plot-scale data. Can. J. Plant Sci. 95: 647Á651. A spreadsheet calculator was developed to estimate farm-scale carrying capacities for swath grazing beef cows with forage yield and quality data from small areas within fields or paddocks. It could be used to compare agronomic treatments for swath grazing potential from plot data when combined with existing beef nutrition equations. Examples using either in vitro true digestibility at 30-h digestion or acid detergent fiber (ADF) in equations to estimate digestible energy were compared with actual field-scale carrying capacities to evaluate the ability of the methods to meet requirements of scale, precision and accuracy. Both methods were capable of estimating carrying capacity at a realistic whole-farm scale, but the ADF-based method was superior with respect to accuracy and precision characteristics.Key words: Carrying capacity, total digestible nutrients, in vitro true digestibility, swath grazing Doce, R. R., Baron, V. S., et Dick, A. C. 2015. Estimation de la capacite´porteuse sur paˆturage fauche´d'apre`s les donne´es recueillies au niveau de la parcelle. Can. J. Plant Sci. 95: 647Á651. Les auteurs ont cre´e´un tableau de calcul pour estimer la capacite´porteuse des e´levages qui engraissent leurs vaches de boucherie sur paˆturages fauche´s a`partir des donne´es sur le rendement et la qualite´des fourrages venant de petites parcelles dans les champs ou les enclos. On pourrait recourir a`cette me´thode pour comparer le potentiel de divers traitements agricoles de paissance sur fauchage en combinant les donne´es issues des parcelles aux e´quations existantes sur la nutrition des bovins. Les auteurs comparent les re´sultats obtenus soit avec la digestibilite´in vitro ve´ritable apre`s 30 h de digestion, soit avec les fibres au de´tergent acide dans les e´quations servant a`estimer l'e´nergie digestible a`la capacite´porteuse re´elle mesure´e au champ pour de´terminer si ces me´thodes satisfont aux exigences minimales d'e´chelle, de pre´cision et d'exactitude. Les deux me´thodes estiment de manie`re re´aliste la capacite´porteuse al 'e´chelle de l'exploitation, mais celle reposant sur les fibres au de´tergent acide se caracte´rise par une exactitude et une pre´cision supe´rieures.Mots clé s: Capacite´porteuse, e´le´ments nutritifs digestibles totaux, digestibilite´in vitro ve´ritable, paissance sur fauchage Swath grazing is an effective method for reducing the cost of over-wintering beef cows. Producers are adopting the practice and require simple methods to choose varieties and species that are nutritionally acceptable for gestating beef cows, while providing adequate yields to reduce cost. Grazing and feeding trials are required to comprehensively evaluate economic feasibility of cultivars and species on the basis of animal responses, but they are intensive in their requirement for land, animals, time, and expense, usually requiring several years (Sollenberger and Bu...
Soluble solids in corn (Zea mays L.) stalks were measured by multiplying the refractometer reading in percent Brix of a small sample of expressed juice by the moisture lost in drying a stalk sample. This method was evaluated by comparison with total sugar determination by the Shaffer‐Somogyi method on the same samples. For individual internodes sampled over the growing season the correlation was r = +0.93**. The ratio of total sugars : soluble solids over a range of genotypes and populations varied from 0.48 to 0.66More rapid estimates of soluble solids in the stalk were obtained by sampling one internode near the ear with the refractometer and multiplying the Brix reading by the moisture lost in drying the entire stalk. Results obtained by using refractometer readings from the ear internode, the internode above the ear, and the internode below the car were highly correlated (r = +0.92**, +O.SO*+, and 0.90**, respectively) with the total sugar content of the stalks.The refractometric technique was an inexpensive, rapid means of determining levels of soluble metabolites in corn stalks and also provided useful estimates of total sugar levels.
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