Effect of Different of Levels Energy and Protein on Performance, Microbial Protein, Some of Metabolites and Ruminal Parameters in Late Pregnancy of Sistani Goat

Document Type : Ruminant Nutrition

Authors

• roghayeh rahmani firozi ¹
• Asadollah teimouri yansari ²
• Essa Dirandeh ¹

¹ Agricultural Sciences and Natural Resources University of Sari

² Department of Animal Sciences, Sari University of Agricultural Sciences and Natural Resources

10.22067/ijasr.v1397i1.66307

Abstract

Introduction[1]Nutrient requirements of goats have not been studied as extensively as those of beef and dairy cattle and sheep. Furthermore, Sistani goats have received less research attention than meat or dairy goats. Goats play an important role in Iran, largely as a source of red meat and milk. Iran has 25 million goats and kids. Results of research on ruminants showed that nutrients can affect prenatal growth if the lack of nutrition during gestation (in utero nutrition) will affect the postnatal growth performance. Dietary nutrient, especially energy and protein, are major factors affecting meat production in goats. During the late gestation, the last two months of pregnancy, eighty percent of the fetal growth occurs, leading to a significant increase in nutrient requirements of the ewe. Underfeeding energy or protein during pregnancy can lead to pregnancy toxemia, sub ketosis, or compromised fetal development, especially at the end of pregnancy when fetal growth rate is highest. The idea of using levels energy and protein in Sistani goat is new Therefore, this experiment conducted to test the effect energy and protein on on performance, digestibility, microbial protein, some of metabolites and ruminal parameters in late pregnancy of goat.  
Materials and Methods The experiment was conducted in the Sari Agricultural Sciences and Natural Resources University (SANRU) of Iran. Humane animal care and handling procedures were followed according to the University’s animal care committee. On 100 days after successful matting, 28 synchronized singleton pregnant Sistani goats (with 3-year-old; body weight = 25±1.6 kg, and body condition score =2.6±0.5) were randomly allocated to four treatments and fed with experimental rations including 1) low protein and low energy diets (LPLE), 2) high protein and low energy (HPLE), 3) low protein and high energy (LPHE), and 4) high protein and high energy (HPHE). Feeds and rations samples were dried at 55°C, ground through a Wiley mill (1-mm screen), and composted by animal. Samples were analyzed for DM, OM, Kjeldahl N, ether extract (AOAC, 2002), ADF, NDF (Van Soest et al., 1991; using heat resistance alpha amylase without sodium sulphate), and ash at 605°C. The NFC was calculated by 100- (CP (%) + NDF (%) + Ash (%) + EE (%). The goats were weighted at the start of experiment, before and1 d after parturition, and Kids weight after birth. Nutrient digestibility, blood parameter, microbial protein synthesis and chewing activity. By measuring urine purine bases microbial protein synthesis was estimated. Rumination and chewing activity animal were measured visually with five-minute intervals over 24 h for all animals. Rumen fluid was collected at o h before feeding and at 3h post feeding. The sample were sealed and placed in freezer before transport to the laboratory for the analysis the NH3 and VFA content.
Results and Discussion Our results showed that the intake of nutrients was increased in HPHE Treatment. Treatment HPLE had highest apparent digestibility than other experimental treatments. Goats on the higher CP diet lost more BW at parturition than other treatments. The lowest pH occurred at 3h post feeding. The ph of rumen fluid after the food ration is provided tends to decrease gradually because of fermentation in the rumen, particularly that of carbohydrates, which are degraded into VFA products. The VFA production increased at 3 h post feeding. There were no differences for microbial protein synthesis but had increase in treatment HPHE for microbial protein synthesis. Concentration of plasma cholesterol was significantly difference at 28d before generation. Glucose concentrations and urea were increased in HPLE treatments and Concentration of plasma triglycerid was lower in goats fed LPLE diet at 14d before generation. Glucose plasma concentration was higher in HPHE than other groups at 2h after generation. The birth live weight of kids was similar between the four groups but LPLE, LPHE and HPHE had numerically lower birth weight. The HPLE group had greatest and LPLE group had lowest body condition score.
Conclusion Overall, these results show that maternal protein feeding during late gestation has been positively associated with kid birth weight and performance. In this experiment, 10 % of CP concentration greater than NRC (2007) recommendation, increased the body weights kids and improved performance of goat. Although, it seems that further experiments are needed.

Keywords

• energy
• goat
• Performance
• pregnancy
• Protein

20.1001.1.20083106.1398.11.1.8.8

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