Serum LH concentrations during seasonal reproductive transitions in criollo x Nubian goats with different nutritional status [Concentraciones de LH en periodos de transición reproductiva en cabras criollas x Nubia con diferente condición nutricional]
Estrada-Cortes E.,Campo Experimental Centro Altos Of Jalisco |
Estrada-Cortes E.,National Autonomous University of Mexico |
Urrutia-Morales J.,Campo Experimental San Luis |
Villagomez-Amezcua E.,National Research Center Disciplinaria en Microbiologia |
And 7 more authors.
Revista Mexicana De Ciencias Pecuarias | Year: 2015
The effect of body energy reserves (BMI) and daily feed intake (FI), on serum LH during transitions into the anovulatory (AT) or breeding season (BT) was determined. Twelve ovariectomized Criollo/Nubian goats, bearing s.c. 17-β estradiol implants, were assigned to two groups of BMI (n=6): high (HBMI) and low BMI (LBMI). Within each BMI group, two subgroups (n=3) were established: with (WFIR) and without (WOFIR) temporal restriction in FI. LH pulse frequency (LHF) and mean (LHM) and basal (LHB) serum LH concentrations were determined. LHF, LHM and LHB gradually diminished during AT (2.08, 1.41, 0.41 pulses/6 h; 2.1, 1.21, 0.51 ng/ml; 1.3, 0.8, 0.4 ng/ ml; P<0.01), whereas LHM and LHB gradually increased during BT (1.01, 1.58, 1.87 ng/ml; 0.57, 0.98, 1.04 ng/ ml; P<0.01). HBMI goats had greater LHF than LBMI goats during AT (2.05 vs 0.55 pulses/6 h; P<0.05) and BT (3.2 vs 0.9 pulses/6 h; P<0.05), and also greater LHM during BT (2.1 vs 0.87 ng/ml; P<0.01). During AT, temporal feed restriction caused an earlier decrease on LHM and LHB in HBMI goats making their profile similar with LBMI goat's profile. During BT, temporal feed restriction diminished LHF and LHB independently of BMI (2.8 vs 1.3 pulses/ 6 h and 1.18 vs 0.55 ng/ml for WOFIR vs WFIR; P<0.05). Body energy reserves and daily feed intake modulate LH secretion during reproductive transitions in Criollo/Nubian goats. Moreover, temporal restriction in feed intake might diminish LH secretion during transition into the anovulatory season, even in goats with high BMI.
Forage production and quality of common vetch mixtures with barley, oat and triticale in four phenological stages [Producción y calidad de forraje en mezclas de veza común con cebada, avena y triticale en cuatro etapas fenológicas]
Najera M.D.J.F.,Campo Experimental Zacatecas |
Gutierrez R.A.S.,Campo Experimental Zacatecas |
Chairez F.G.E.,Campo Experimental Zacatecas |
Luna R.G.,Campo Experimental Zacatecas |
And 2 more authors.
Revista Mexicana De Ciencias Pecuarias | Year: 2016
The objective was to determine forage yield and quality of vetch mixtures with barley, oat and triticale in two seeding ratios (65:35; 35:65) at four phenological stages. To this end, a randomized block design with factorial array (3×4×4) and four replications was established. The greatest dry matter yield was obtained from the oat-vetch mixture at the grain doughy stage of maturity (16.6 t ha-1; P<0.00), while the seed proportion with the highest production was from the oat-vetch (65:35) ratio with 19.9 t ha-1 during the dough grain stage. The highest amount of crude protein was obtained from the oat-vetch (178 g kg-1 MS) and triticale-vetch (161 g kg-1 MS) mixtures during booting stage. The monoculture vetch and oats-vetch (35:65) proportion, both had lower amounts of neutral detergent fiber at the mature grain stage (P<0.001). The oat, vetch and triticale monocultures showed the lowest acid detergent fiber during milky grain stage (P<0.001). The greatest percentage of TDN was observed in vetch monoculture and its mixtures with barley (65:35) during the milky grain stage, respectively (P<0.001). The monoculture vetch provided highest values for NEL and RFV (P<0.001). In conclusion, the forage yield and quality of vetch mixtures with barley, oat and triticale depend on the maturity stage. Also, the oat-vetch mixture showed the greatest dry matter yield and high CP concentration. In addition, forage relative value was higher during the mature grain stage.
Morales J.U.,Campo Experimental San Luis |
Alatorre J.A.H.,Campo Experimental San Luis |
Escalante A.A.,Autonomous University of San Luis Potosi |
Lopez S.B.,Campo Experimental San Luis |
And 2 more authors.
Journal of Animal and Veterinary Advances | Year: 2011
In dry land cropping of semiarid regions is important to harvest forage as early as possible in order to avoid frost damage incidence. The possibility of advancing, depend on the forage quality when harvested at early growth stages and the method used to preserve it. The objective of this study was to evaluate the productivity and nutritive value of pearl millet harvested at four different stages of maturity for Silage (S) and Hay (H) methods of conservation. A randomized complete block design with five replications in a split plot outline was used for the methods of forage conservation. The open pollinated variety ICMV-221 was used. The ages of maturity at harvest were: Boot stage (B), female Flowering (F), Milk stage (M) and Dough stage (D). The production of total Dry Matter (DM ha-1) increased with maturity (p<0.002). In contrast, DM from re-growth was higher (p<0.0001) when forage was cut at B stage. This led to the total DM ha-1 resulted similar throughout four stages of maturity. During haymaking, there was a loss of grain by fauna which affected most of the variables studied. Protein Content (PC) varied (p<0.01 ) from 6.93-11.35% with lowest values during M and D hay stages. The highest NDF, ADF and lignin content were observed during M and D hay stages. Apparent digestibility of dry matter was higher in silage than hay. Age of cutting only affected the digestibility of hay. It was concluded that the stage of maturity of pearl millet did not affect the quality of silage showing silage generally better nutritional value than hay. The loss of grain of haymaking in this study indicates that in the presence of fauna (lagomorphs, rodents and birds), pearl millet is adequate for haying only at booting and flowering stages. Re-growths were stronger in booting, compensating lower production of dry matter from the main stem during early cuttings. © Medwell Journals, 2011.
Arellano-Arciniega S.,Instituto Nacional de Investigaciones Nucleares |
Osuna-Ceja E.S.,Instituto Nacional de Investigaciones Nucleares |
Martinez-Gamino M.A.,Campo Experimental San Luis |
Reyes-Muro L.,Instituto Nacional de Investigaciones Nucleares
Revista Fitotecnia Mexicana | Year: 2015
At the semi-arid region of the Centre-North of México, dry bean (Phaseolus vulgaris L.) is an important crop cultivated under rainfed conditions. Two varieties Flor de Junio Dalia and Pinto Coloso were evaluated in 2013 regarding the effect of the application of cattle manure on the grain yield of the two dry bean varieties: Flor de Junio Dalia (planted on June 21) and Pinto Coloso (on August 5), in triple row beds with in situ rainwater catchment under rainfed conditions. The system was used for the water catchment from "corrugation with Aqueel" and "tidge". Manure doses and chemical fertilizer were 0, 10 and 20 t ha-1 and 80-40-30 kg ha-1 N, P y K, applied annually for three consecutive years. Treatments showing higher grain yield were 10 and 20 t ha-1 of manure (2.3 and 2.1 t ha-1) with Flor de Junio Dalia and Pinto Coloso (1.4 and 1.1 t ha-1, respectively). Manure increased organic matter (OM) content in the first 10 cm of soil depth, and with 20 t ha-1 the soil showed the highest content of NO3- (14.85 mg kg-1; 0-10 cm layer).
Morales J.U.,Campo Experimental San Luis |
Alatorre A.H.,Campo Experimental San Luis |
Becerra J.F.C.,Campo Experimental San Luis |
Vazquez H.G.,Campo Experimental San Luis
Revista Mexicana De Ciencias Pecuarias | Year: 2014
The present study was conducted in order to evaluate the nutritive value of pearl millet forage harvested at different maturity states. The study was made under watering conditions with ICMV-221 two purposes variety. Four samples were taken at each four maturity states: (LS) leaf 7th, (FL) flag leaf, (BS) boot stage, and (F) flowering. The samples were analyzed by NIRS (near infrared spectroscopy) to determine the nutrients content and results were subjected to analysis of variance into complete randomly model. Organic matter content increased with maturity (P<0.003), while crude protein content was higher (P<0.005) in LS. Non fiber carbohydrates did not show significant changes (P>0.05) with maturity. Neutral detergent fiber (NDF) content was similar (P>0.05) in the four maturity stages, but acid detergent fiber (ADF) content increased (P<0.008) from LS to F stage. Lignin and lignin linked to NDF increased (P<0.05) with age. Dry matter digestibility was reduced (P<0.0005) with age from 81.7 % in LS to 69.0 % in F stage. Energy contents tend to reduce with maturity of forage, but not significant differences were detected (P>0.05). Results indicated that age of pearl millet forage at harvest affected in a significant way almost all parameters of nutritive value. Younger forages showed the best nutritive characteristics.