Chemical and Mineral Composition, Kinetics of Degradation and in vitro Gas Production of Native Cactus

Abstract

This study aimed to evaluate the chemical and minerals composition, fractions of carbohydrate and nitrogen compounds, kinetics of degradation and in vitro gas production of native cactus species of the brazilian Semiarid. The experiment was conducted in a completely randomized design, with five native cactus species and 4 replications per species were randomly selected. The native cactus species evaluated were: Cereus jamacaru DC., Melocactus bahiensis Br. Et Rose Werderm, Opuntia inamoene K. Schum, Pilosocereus gounellei (A. Weber ex K. Schum) Bly ex Rowl and Pilosocereus pachycladus Ritter, all in natura. The native cactus species showed differences for chemical and mineral compositions (P <0.05). The nitrogenous components, C. jamacaru cactaceae presented higher contents of fractions A (228.1 g/kg CP) and B3 (241.7 g/kg CP) and smaller fraction C (174.0 g/kg CP). For carbohydrate fraction C. jamacaru presented lower fractions A + B1 (412.2 g/kg TC) and C (38.2 g/kg TC) and high fraction B2 (549.7 g/kg TC) and low fraction C. The cactus C. jamacaru and M. bahiensis presented a high PD (856.6 and 837.9 g/kg DM, respectively). The parameters a and b and the effective degradability present diferences (P<0.05) in function of 2% and 5% passage rate. The in vitro true digestibility of dry matter was above 700 g/kg of DM for all species. Cactus have high levels of potentially digestible fractions of total carbohydrates, indicating their importance as food for ruminants in created in the semiarid, where Caatinga vegetation is a basal resource.

Chemical composition, fractionation of carbohydrates and nitrogen compounds, ruminal degradation kinetics, and in vitro gas production of cactus pear genotypes

“…The pressure caused by fermentation was measured using a pressure transducer (Data logger Universal Logger AG100). The readings were made with a higher rate during the initial period and at a lower rate towards the end of the study period (2,4,6,8,10,12,15,18,21,24,30,36,42, and 48 hours of incubation). Pressure data (P) in psi (pressure per square inch) were converted into gas volume (V) by the equation: V = 5.1612P -0.3017, R 2 = 0.9873, generated in the Production Laboratory (LPG) of the Academic Unit of Garanhuns, UFRPE, based on 937 observations (-8°90'77" S, -36°49'49" W, altitude of 844 meters), 1 psi = 4.859 mL of gas.…”

“…Moreover, it has low neutral detergent fiber (304 g/kg dry matter) and acid detergent fiber contents (159.7 g/kg dry matter) (7) and a high non-fiber carbohydrate content (471.5 g/kg dry matter (8) ). Although it is a food routinely used for ruminant feed in the Brazilian Semiarid, to the best of our knowledge, comparative studies on fractions of carbohydrates, nitrogen compounds, and the kinetic parameters of in vitro degradation of different varieties of cactus pear are scarce (9,10) .…”

Intake, digestibility, and ingestive behavior of sheep fed with thornless Mandacaru, cactus pear genotypes Orelha de Elefante Mexicana and Miúda

“…The digestibility of DM and OM, NDF, TC, NFC, and TDN did not differ (P > 0.05) between the experimental diets (Table 5). Previous studies have observed intermediate to high digestibility values of DM and OM, ranging from 660.1 to 809.0 g kg -1 , and 672.6 to 832.0 g kg -1 , respectively, in diets of sheep fed Cereus and forage cactus, or in vitro study (Bispo et al, 2007;Costa et al, 2012;Magalhães et al, 2019;Lopes et al, 2020). These values are influenced by the high NFC and low NDF values of these cacti.…”

Condensed tannins extracted from Quebracho affect the fermentation profile, nutritional quality and in vitro gas production of pornunça (Manihot spp.) silages

“…The increase in the levels of TC in pornunça silages affected the levels of ADIN, ADIP (in g/kg ADF), NDIP and ADIP (in g/kg CP) contents. These variables are related to the availability of the protein, due to the formation of the tannin-protein complex, which is strongly associated with the constituents of the cell wall, mainly lignin and Maillard compounds, highly resistant to microbial and enzymatic degradation, and ADIP is considered unusable, both in the rumen and in the animal intestine (Magalhães et al, 2019;Bueno et al, 2020).…”