Ricardo Alves de Araújo1*, Roberto Cláudio Fernandes Franco Pompeu2, Luiza de Nazaré Carneiro da Silva3 and José Neuman Miranda Neiva3
1State University of Maranhão, Itapecuru Mirim, Maranhão, Brazil
2Brazilian Agricultural Research Corporation, Sobral, Ceará, Brazil
3Federal University of Tocantins, Araguaina, Tocantins, Brazil
*Corresponding author: Ricardo Alves de Araújo, State University of Maranhão, Itapecuru Mirim, Maranhão, Brazil
Submission: January 05, 2021;Published: February 05, 2021
ISSN: 2576-9162 Volume8 Issue2
We evaluated the influence of the substitution of soybean meal (SM) by detoxified castor cake (DCC) on the function hepatic and renal of goats fed with diets containing DCC by alkaline solutions in confinement regime during different stages of biological development (growth, pregnancy and lactation). The treatments consisted of three diets, a formulated with corn and soybean meal (SM) and the others were formulated with detoxified castor cake by calcium hydroxide (Ca(OH)2 DCC) and another composed by detoxified castor by DCC of sodium hydroxide (NaOH). In relation to renal and hepatic parameters showed that there was interaction between the diets and biological stages on the levels of total proteins, direct bilirubin, albumin, alanine aminotransferase, aspartate aminotransferase, gamma glutamyl transferase. In a general way, the goats fed with both castor cake, regardless of the stage evaluated had higher levels. The detoxified castor cake by alkaline solutions in replacement of soybean meal proved to be a viable alternative in the feeding of goats in the three-stage biological, because it does not affect the functionality of the liver and kidney function.
Among the biological stages of ruminants there is a great variation in each phase, marked mainly by the variation of the intake of dry matter and nutrients . In each stage occurs an intense cascade of hormonal variations which influence directly the consumption of foods for these animals. Another factor, in addition to the hormonal action is the activation of receptors of tension due to the ruminal compression exerted by the increase in size of the organs. In dairy goats, for example, in order for the lactation phase to be efficiently productive, there is a need for physiologically well-developed goats. Therefore, the rearing phase is of paramount importance, since the formation of healthy, well-nourished and physiologically developed matrices will later reflect healthy pregnancies and lactations. Based on this, the use of these by-products can make this phase more efficient and reflect on the others, as the rearing determines the productive potential of the future dairy goat. The recent increase in the inclusion of biodiesel in the world energy matrix has led to the production of ruminant feeds from by-products or cakes obtained after extraction of oil from oilseeds, which constitute the main by-products of the biodiesel production chain. Thus, a possibility of integrating the agroenergy and agricultural chains, and generating employment and income has emerged, in addition to possibly minimizing the environmental problems caused by these residues. Thus, considering the possibility of using by-products from the biodiesel chain in diets for ruminants, giving these by-products an efficient destination and incorporating them into the dairy goat production chain, the objective was to evaluate the influence of detoxified castor cake by alkaline solutions on renal and hepatic metabolic profile of Saanen and Anglo Nubian goats during different biological stages (growth, pregnancy and lactation).
Experimental area and trial period
The study was conducted at the Technological Center of production of goat milk from Embrapa Goats and Sheep (3º44'57.42" south and 40°20'43.50" West) located in the city of Sobral-CE, Brazil, in the period from June 2015 to May 2017. All procedures involving animals were carried out in accordance with the regulations of the Commission of Ethics in the use of animals in the Empresa Brasileira de Pesquisa Agropecuária, Centro Nacional de Pesquisa with goats, protocol no. 005/2015.
Animals, experimental design and diets
Eighteen goats were evaluated in each stage, being 9 Saanen and 9 Anglo Nubian. The same goats were evaluated in each stage biological. In the growth phase (270 days), they had the following characteristics: goats with 43±2.97 kg body weight and body condition scores of 2.5±0.5 were used. In pregnancy (160 days): goats with body weight of 42.08±5.33kg of body condition score of 3.6±0.3 according to the classification of . All tests were performed on two occasions, the first when the goats were with 30 to 100 days of gestation (first and second third) and the second from 110 to 140 days of pregnancy, representing the final third of pregnancy and performed the averages to represent this stage. In lactation (150 days): goats with 43±2.97kg body weight and body condition scores of 2.5±0.5. In this way, the experiment had a duration of 580 days without interruption.
The goats were placed in individual stalls, suspended and with floor ripped of 5.06m², being 2.87m² solarium area composed of beaten floor, provided with drinkers, feeders and saltshakers. The measurement of live weight was performed fortnightly in proper balance. The animals were weighed always at the same time and in fasting. The treatments consisted of three diets, a formulated with corn and soybean meal (SM) and the others were formulated with detoxified castor cake by calcium hydroxide (Ca(OH)2 DCC) and another composed by detoxified castor by DCC of sodium hydroxide (NaOH), having the same levels of protein and energy and was used as roughage hay tifton-85.
Detoxification and ricin measurement
Castor cakes used in this study were obtained after collecting oil, by mechanically pressing castor bean seeds at temperatures between 90 and 100 °C. After mixing the cakes with reagents and water for 3 hours (mixing for 10 min and resting for 30 min, alternately), the cakes were placed outdoors on a plastic canvas for 48 hours and constantly rolled with a squeegee adapted for homogeneous drying. After drying, the cakes were chopped using a forage machine to reduce the material size and to facilitate its homogenization with the other ingredients.
The concentrations of alkaline products (calcium hydroxide and sodium hydroxide) used for 100% detoxification of ricin in crude castor cakes were 90g Ca(OH)2 and 60g NaOH per kilogram, respectively, which were diluted in 2L of water using a stationary mixer (Fischer® MOB 400G2) equipped with a three-phase motor. No hemagglutinating activity was observed at those concentrations, i.e., ricinus agglutinin was no longer active (Figure 1), therefore, these two concentrations were used to formulate the diets.
Figure 1:Electrophoretic characterization of castor cake proteins treated with different chemical products. 1:
Molecular weight marker (kDa); L: Lectins;
2: Crude castor cake;
3: Detoxified castor cake Ca(OH)2;
4: Detoxified castor cake NaOH.
Data management and collection
Blood samples were collected using 9.0mL vacutainer tubes (Grainer Bio-One, Vacuette® Americana, SP, BRA), by puncturing the jugular vein, five days before the end of the rearing phase, and 4h after the morning feed. Two blood samples were collected from each animal; one in a tube containing an anticoagulant (EDTA) and another in a tube without the anticoagulant. The tubes with the anticoagulant were used for analyzing urea and total protein concentration, while samples without the anticoagulant were used for analyzing creatinine, total and direct bilirubin, albumin, alkaline phosphatase, alanine aminotransferase (ALT), aspartate aminotransferase (AST), and gamma-glutamyltransferase (GGT) levels. To determine urea and total protein concentration, serum was obtained by centrifuging the tubes at 3,293×g for 15 min, identified and stored in Eppendorf® mini-tubes, and frozen for analysis. Blood parameters and urine creatinine were analyzed with commercial Labtest® kits using colorimetric procedures.
Data were initially subjected to normality tests (Shapiro–Wilk) and homoscedasticity tests (Levene), and were also submitted to analysis of variance by the F test when the presuppositions were met, by using the following model:
Yijk = μ + ∝i + βj + (∝β)ij + eijk,
where Yijk is the dependent variable corresponding to the experimental observation; μ is the overall mean; αi is the fixed effect of the diets; βj is the fixed effect different stages biological; (αβ)ij is the interaction effect; and eijk is the random error, assuming an independent normal distribution. Interaction between diet and at different stages biological was only considered when significant at 5% probability. A comparison of means was carried out by Tukey test at 5% probability to evaluate the effects of breed, diet and different stages biological. Statistical analyses were performed using the GLM procedure of the SAS software version 9.3 .
In relation to renal and hepatic parameters (Table 1) showed that there was interaction between the diets and biological stages on the levels of total proteins, direct bilirubin, albumin, alanine aminotransferase, aspartate aminotransferase, gamma glutamyl transferase.
Table 1:Total proteins (TP), direct bilirubin (DB), albumin (ALB), urea (URE), alkaline phosphatase (AP), alanine aminotransferase (ALT), aspartate aminotransferase (AST) and gamma-glutamyltransferase (GGT) of goats fed with detoxified castor cake during the biological stage.
MSE: Mean standard error. Averages followed by common lowercase letters in the lines and by uppercase letters in the columns do not differ from one another according to the Tukey test at 5% significance.
In a general way, the goats fed with both castor cake, regardless of the stage evaluated had higher levels of total proteins in the bloodstream (7.87g dL-1 and 8.06g dL-1 to Ca(OH)2 DCC and NaOH DCC, respectively). In relation to the content of direct bilirubin can be observed higher levels during gestation and lactation (0.95 and 1.23mg dL-1, respectively). The blood urea was higher during the stage of lactation (38.85mg dL-1), being twice the growth stage (19.42mg dL-1) as well as the alkaline phosphatase, which was 10.98UI L-1 during lactation of goats. In relation to ALT, AST and GGT, one can observe a wide variation, both in terms of diets, much of the biological stage. The ALT was greater for the goats fed with the diet during the three stages, being that during lactation did not differ from goats fed with diet based Ca(OH)2 DCC. On the other hand, AST was lower during lactation of goats, already the GGT was higher during the shew of lactation for the goats fed with both diets the basis of DCC.
The average levels of enzymes for hepatic and renal functions are within the standards for species, according to  on the three biological stages evaluated  found similar values to this work, to evaluate the response of the liver-kidney in Saanen goats fed with castor bean meal. The reduction of AST during lactation is common, because , says that all the enzymes related to liver function are generally reduced during the lactation period, due to the expansion of the extracellular fluid. Despite this, the values were within the reference range for the species , thus discarding a possible deficit in protein metabolism in three stages of development, which is not common due during pregnancy, because the greater metabolic demand during pregnancy  could decrease the concentration of some enzymes in blood, but the quantity of nontoxic metabolites decreased biological at this stage.
In relation to the higher concentration of urea in goats fed with SM and Ca(OH)2 DCC may be related the highest levels to lower filtration of nitrogen after detoxification of ammonia in the liver, considering that the goats fed with SM and Ca(OH)2 DCC had a higher consumption of protein . In relation to the effect of the biological stages on the urea,  asserts that it is common for the decrease of the concentration of urea during growth, because this reduction is not only a result of increased glomerular filtration, but also due to a reduction in the hepatic synthesis. With the increase of progesterone and estrogen concentrations, the activity of the enzymes decreases the urea cycle .
The detoxified castor cake by alkaline solutions in replacement of soybean meal proved to be a viable alternative in the feeding of goats during the three-stage biological, because it does not affect the functionality of the liver and kidney function.
© 2021 Ricardo Alves de Araújo. This is an open access article distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and build upon your work non-commercially.